diff --git a/swad_changelog.h b/swad_changelog.h
index 856ddc327..878d44173 100644
--- a/swad_changelog.h
+++ b/swad_changelog.h
@@ -355,10 +355,11 @@ En OpenSWAD:
 ps2pdf source.ps destination.pdf
 */
 
-#define Log_PLATFORM_VERSION	"SWAD 18.11.2 (2018-10-30)"
+#define Log_PLATFORM_VERSION	"SWAD 18.11.4 (2018-10-30)"
 #define CSS_FILE		"swad18.4.css"
 #define JS_FILE			"swad17.17.1.js"
 /*
+	Version 18.11.4:  Oct 30, 2018  Joining building and performing query into one function. (235593 lines)
 	Version 18.11.3:  Oct 30, 2018  Joining building and performing query into one function. (235553 lines)
 	Version 18.11.2:  Oct 30, 2018  Joining building and performing query into one function. (235531 lines)
 	Version 18.11.1:  Oct 30, 2018  Joining building and performing query into one function. (235497 lines)
diff --git a/swad_course.c b/swad_course.c
index d4f71fe58..919d6c73a 100644
--- a/swad_course.c
+++ b/swad_course.c
@@ -3124,9 +3124,8 @@ void Crs_GetAndWriteCrssOfAUsr (const struct UsrData *UsrDat,Rol_Role_t Role)
   }
 
 /*****************************************************************************/
-/****************************** List courses found ***************************/
+/**************************** List courses found *****************************/
 /*****************************************************************************/
-// Returns number of courses found
 
 void Crs_ListCrssFound (MYSQL_RES **mysql_res,unsigned NumCrss)
   {
diff --git a/swad_degree.c b/swad_degree.c
index 6db66dfda..12de79973 100644
--- a/swad_degree.c
+++ b/swad_degree.c
@@ -2552,22 +2552,19 @@ void Hie_GetAndWriteInsCtrDegAdminBy (long UsrCod,unsigned ColSpan)
   }
 
 /*****************************************************************************/
-/****************************** List degrees found ***************************/
+/**************************** List degrees found *****************************/
 /*****************************************************************************/
-// Returns number of degrees found
 
-unsigned Deg_ListDegsFound (void)
+void Deg_ListDegsFound (MYSQL_RES **mysql_res,unsigned NumDegs)
   {
    extern const char *Txt_degree;
    extern const char *Txt_degrees;
-   MYSQL_RES *mysql_res;
    MYSQL_ROW row;
-   unsigned NumDegs;
    unsigned NumDeg;
    struct Degree Deg;
 
    /***** Query database *****/
-   if ((NumDegs = (unsigned) DB_QuerySELECT_new (&mysql_res,"can not get degrees")))
+   if (NumDegs)
      {
       /***** Start box and table *****/
       /* Number of degrees found */
@@ -2587,7 +2584,7 @@ unsigned Deg_ListDegsFound (void)
 	   NumDeg++)
 	{
 	 /* Get next degree */
-	 row = mysql_fetch_row (mysql_res);
+	 row = mysql_fetch_row (*mysql_res);
 
 	 /* Get degree code (row[0]) */
 	 Deg.DegCod = Str_ConvertStrCodToLongCod (row[0]);
@@ -2604,7 +2601,5 @@ unsigned Deg_ListDegsFound (void)
      }
 
    /***** Free structure that stores the query result *****/
-   DB_FreeMySQLResult (&mysql_res);
-
-   return NumDegs;
+   DB_FreeMySQLResult (mysql_res);
   }
diff --git a/swad_degree.h b/swad_degree.h
index 2890d94f4..e2b2272d3 100644
--- a/swad_degree.h
+++ b/swad_degree.h
@@ -143,6 +143,6 @@ unsigned Deg_GetNumDegsInCtr (long CtrCod);
 unsigned Deg_GetNumDegsWithCrss (const char *SubQuery);
 unsigned Deg_GetNumDegsWithUsrs (Rol_Role_t Role,const char *SubQuery);
 
-unsigned Deg_ListDegsFound (void);
+void Deg_ListDegsFound (MYSQL_RES **mysql_res,unsigned NumCrss);
 
 #endif
diff --git a/swad_department.c b/swad_department.c
index ab521eedf..ea20f8af9 100644
--- a/swad_department.c
+++ b/swad_department.c
@@ -281,27 +281,26 @@ void Dpt_GetListDepartments (long InsCod)
 	    sprintf (OrderBySubQuery,"NumTchs DESC,FullName");
 	    break;
 	}
-      DB_BuildQuery ("(SELECT departments.DptCod,departments.InsCod,"
-		     "departments.ShortName,departments.FullName,departments.WWW,"
-		     "COUNT(DISTINCT usr_data.UsrCod) AS NumTchs"
-		     " FROM departments,usr_data,crs_usr"
-		     " WHERE departments.InsCod=%ld"
-		     " AND departments.DptCod=usr_data.DptCod"
-		     " AND usr_data.UsrCod=crs_usr.UsrCod"
-		     " AND crs_usr.Role IN (%u,%u)"
-		     " GROUP BY departments.DptCod)"
-		     " UNION "
-		     "(SELECT DptCod,InsCod,ShortName,FullName,WWW,0 AS NumTchs"
-		     " FROM departments"
-		     " WHERE InsCod=%ld AND DptCod NOT IN"
-		     " (SELECT DISTINCT usr_data.DptCod FROM usr_data,crs_usr"
-		     " WHERE crs_usr.Role IN (%u,%u) AND crs_usr.UsrCod=usr_data.UsrCod))"
-		     " ORDER BY %s",
-	             InsCod,(unsigned) Rol_NET,(unsigned) Rol_TCH,
-	             InsCod,(unsigned) Rol_NET,(unsigned) Rol_TCH,
-	             OrderBySubQuery);
-      Gbl.Dpts.Num = (unsigned) DB_QuerySELECT_new (&mysql_res,"can not get departments");
-
+      Gbl.Dpts.Num = (unsigned) DB_QuerySELECT (&mysql_res,"can not get departments",
+						"(SELECT departments.DptCod,departments.InsCod,"
+						"departments.ShortName,departments.FullName,departments.WWW,"
+						"COUNT(DISTINCT usr_data.UsrCod) AS NumTchs"
+						" FROM departments,usr_data,crs_usr"
+						" WHERE departments.InsCod=%ld"
+						" AND departments.DptCod=usr_data.DptCod"
+						" AND usr_data.UsrCod=crs_usr.UsrCod"
+						" AND crs_usr.Role IN (%u,%u)"
+						" GROUP BY departments.DptCod)"
+						" UNION "
+						"(SELECT DptCod,InsCod,ShortName,FullName,WWW,0 AS NumTchs"
+						" FROM departments"
+						" WHERE InsCod=%ld AND DptCod NOT IN"
+						" (SELECT DISTINCT usr_data.DptCod FROM usr_data,crs_usr"
+						" WHERE crs_usr.Role IN (%u,%u) AND crs_usr.UsrCod=usr_data.UsrCod))"
+						" ORDER BY %s",
+						InsCod,(unsigned) Rol_NET,(unsigned) Rol_TCH,
+						InsCod,(unsigned) Rol_NET,(unsigned) Rol_TCH,
+						OrderBySubQuery);
       if (Gbl.Dpts.Num) // Departments found...
 	{
 	 /***** Create list with courses in degree *****/
@@ -377,24 +376,23 @@ void Dpt_GetDataOfDepartmentByCod (struct Department *Dpt)
    else if (Dpt->DptCod > 0)
      {
       /***** Get data of a department from database *****/
-      DB_BuildQuery ("(SELECT departments.InsCod,departments.ShortName,departments.FullName,departments.WWW,"
-		     "COUNT(DISTINCT usr_data.UsrCod) AS NumTchs"
-		     " FROM departments,usr_data,crs_usr"
-		     " WHERE departments.DptCod=%ld"
-		     " AND departments.DptCod=usr_data.DptCod"
-		     " AND usr_data.UsrCod=crs_usr.UsrCod"
-		     " AND crs_usr.Role=%u"
-		     " GROUP BY departments.DptCod)"
-		     " UNION "
-		     "(SELECT InsCod,ShortName,FullName,WWW,0"
-		     " FROM departments"
-		     " WHERE DptCod=%ld AND DptCod NOT IN"
-		     " (SELECT DISTINCT usr_data.DptCod FROM usr_data,crs_usr"
-		     " WHERE crs_usr.Role=%u AND crs_usr.UsrCod=usr_data.UsrCod))",
-		     Dpt->DptCod,(unsigned) Rol_TCH,
-		     Dpt->DptCod,(unsigned) Rol_TCH);
-      NumRows = DB_QuerySELECT_new (&mysql_res,"can not get data of a department");
-
+      NumRows = DB_QuerySELECT (&mysql_res,"can not get data of a department",
+				"(SELECT departments.InsCod,departments.ShortName,departments.FullName,departments.WWW,"
+				"COUNT(DISTINCT usr_data.UsrCod) AS NumTchs"
+				" FROM departments,usr_data,crs_usr"
+				" WHERE departments.DptCod=%ld"
+				" AND departments.DptCod=usr_data.DptCod"
+				" AND usr_data.UsrCod=crs_usr.UsrCod"
+				" AND crs_usr.Role=%u"
+				" GROUP BY departments.DptCod)"
+				" UNION "
+				"(SELECT InsCod,ShortName,FullName,WWW,0"
+				" FROM departments"
+				" WHERE DptCod=%ld AND DptCod NOT IN"
+				" (SELECT DISTINCT usr_data.DptCod FROM usr_data,crs_usr"
+				" WHERE crs_usr.Role=%u AND crs_usr.UsrCod=usr_data.UsrCod))",
+				Dpt->DptCod,(unsigned) Rol_TCH,
+				Dpt->DptCod,(unsigned) Rol_TCH);
       if (NumRows) // Department found...
         {
          /* Get row */
diff --git a/swad_duplicate.c b/swad_duplicate.c
index bdfaa8255..8de9b777b 100644
--- a/swad_duplicate.c
+++ b/swad_duplicate.c
@@ -145,12 +145,13 @@ void Dup_ListDuplicateUsrs (void)
    Box_StartBox (NULL,Txt_Possibly_duplicate_users,NULL,
                  Hlp_USERS_Duplicates_possibly_duplicate_users,Box_NOT_CLOSABLE);
 
-   /***** Build query *****/
-   DB_BuildQuery ("SELECT UsrCod,COUNT(*) AS N,MIN(UNIX_TIMESTAMP(InformTime)) AS T"
-		  " FROM usr_duplicated"
-		  " GROUP BY UsrCod"
-		  " ORDER BY N DESC,T DESC");
-   NumUsrs = (unsigned) DB_QuerySELECT_new (&mysql_res,"can not get possibly duplicate users");
+   /***** Make query *****/
+   NumUsrs = (unsigned) DB_QuerySELECT (&mysql_res,"can not get possibly"
+						   " duplicate users",
+					"SELECT UsrCod,COUNT(*) AS N,MIN(UNIX_TIMESTAMP(InformTime)) AS T"
+				        " FROM usr_duplicated"
+				        " GROUP BY UsrCod"
+				        " ORDER BY N DESC,T DESC");
 
    /***** List possible duplicated users *****/
    if (NumUsrs)
@@ -266,27 +267,26 @@ static void Dup_ListSimilarUsrs (void)
    Box_StartBox (NULL,Txt_Similar_users,NULL,
                  Hlp_USERS_Duplicates_similar_users,Box_NOT_CLOSABLE);
 
-   /***** Build query *****/
+   /***** Make query *****/
    if (Gbl.Usrs.Other.UsrDat.Surname1[0] &&
        Gbl.Usrs.Other.UsrDat.FirstName[0])	// Name and surname 1 not empty
-     {
-      DB_BuildQuery ("SELECT DISTINCT UsrCod FROM"
-		     "(SELECT DISTINCT UsrCod FROM usr_IDs"
-		     " WHERE UsrID IN (SELECT UsrID FROM usr_IDs WHERE UsrCod=%ld)"
-		     " UNION"
-		     " SELECT UsrCod FROM usr_data"
-		     " WHERE Surname1='%s' AND Surname2='%s' AND FirstName='%s')"
-		     " AS U",
-		     Gbl.Usrs.Other.UsrDat.UsrCod,
-		     Gbl.Usrs.Other.UsrDat.Surname1,
-		     Gbl.Usrs.Other.UsrDat.Surname2,
-		     Gbl.Usrs.Other.UsrDat.FirstName);
-     }
+      NumUsrs = (unsigned) DB_QuerySELECT (&mysql_res,"can not get similar users",
+					   "SELECT DISTINCT UsrCod FROM"
+					   "(SELECT DISTINCT UsrCod FROM usr_IDs"
+					   " WHERE UsrID IN (SELECT UsrID FROM usr_IDs WHERE UsrCod=%ld)"
+					   " UNION"
+					   " SELECT UsrCod FROM usr_data"
+					   " WHERE Surname1='%s' AND Surname2='%s' AND FirstName='%s')"
+					   " AS U",
+					   Gbl.Usrs.Other.UsrDat.UsrCod,
+					   Gbl.Usrs.Other.UsrDat.Surname1,
+					   Gbl.Usrs.Other.UsrDat.Surname2,
+					   Gbl.Usrs.Other.UsrDat.FirstName);
    else
-      DB_BuildQuery ("SELECT DISTINCT UsrCod FROM usr_IDs"
-		     " WHERE UsrID IN (SELECT UsrID FROM usr_IDs WHERE UsrCod=%ld)",
-	             Gbl.Usrs.Other.UsrDat.UsrCod);
-   NumUsrs = (unsigned) DB_QuerySELECT_new (&mysql_res,"can not get similar users");
+      NumUsrs = (unsigned) DB_QuerySELECT (&mysql_res,"can not get similar users",
+					   "SELECT DISTINCT UsrCod FROM usr_IDs"
+					   " WHERE UsrID IN (SELECT UsrID FROM usr_IDs WHERE UsrCod=%ld)",
+					   Gbl.Usrs.Other.UsrDat.UsrCod);
 
    /***** List possible similar users *****/
    if (NumUsrs)
diff --git a/swad_enrolment.c b/swad_enrolment.c
index 6c4549e1f..6e8ab6de3 100644
--- a/swad_enrolment.c
+++ b/swad_enrolment.c
@@ -477,12 +477,12 @@ void Enr_GetNotifEnrolment (char SummaryStr[Ntf_MAX_BYTES_SUMMARY + 1],
    // This function may be called inside a web service, so don't report error
 
    /***** Get user's role in course from database *****/
-   DB_BuildQuery ("SELECT Role"
-		  " FROM crs_usr"
-		  " WHERE CrsCod=%ld AND UsrCod=%ld",
-                  CrsCod,UsrCod);
-   if (DB_QuerySELECT_new (&mysql_res,"can not get user's role"
-	                              " in course") == 1)	// Result should have a unique row
+   if (DB_QuerySELECT (&mysql_res,"can not get user's role"
+	                          " in course",
+		       "SELECT Role"
+		       " FROM crs_usr"
+		       " WHERE CrsCod=%ld AND UsrCod=%ld",
+		       CrsCod,UsrCod) == 1)	// Result should have a unique row
      {
       /***** Get user's role in course *****/
       row = mysql_fetch_row (mysql_res);
@@ -859,17 +859,18 @@ void Enr_RemoveOldUsrs (void)
    SecondsWithoutAccess = (time_t) MonthsWithoutAccess * Dat_SECONDS_IN_ONE_MONTH;
 
    /***** Get old users from database *****/
-   DB_BuildQuery ("SELECT UsrCod FROM"
-		  "("
-		  "SELECT UsrCod FROM usr_last WHERE"
-		  " LastTime<FROM_UNIXTIME(UNIX_TIMESTAMP()-'%lu')"
-		  " UNION "
-		  "SELECT UsrCod FROM usr_data WHERE"
-		  " UsrCod NOT IN (SELECT UsrCod FROM usr_last)"
-		  ") AS candidate_usrs"
-		  " WHERE UsrCod NOT IN (SELECT DISTINCT UsrCod FROM crs_usr)",
-                  (unsigned long) SecondsWithoutAccess);
-   if ((NumUsrs = DB_QuerySELECT_new (&mysql_res,"can not get old users")))
+   NumUsrs = DB_QuerySELECT (&mysql_res,"can not get old users",
+			     "SELECT UsrCod FROM"
+			     "("
+			     "SELECT UsrCod FROM usr_last WHERE"
+			     " LastTime<FROM_UNIXTIME(UNIX_TIMESTAMP()-'%lu')"
+			     " UNION "
+			     "SELECT UsrCod FROM usr_data WHERE"
+			     " UsrCod NOT IN (SELECT UsrCod FROM usr_last)"
+			     ") AS candidate_usrs"
+			     " WHERE UsrCod NOT IN (SELECT DISTINCT UsrCod FROM crs_usr)",
+			     (unsigned long) SecondsWithoutAccess);
+   if (NumUsrs)
      {
       snprintf (Gbl.Alert.Txt,sizeof (Gbl.Alert.Txt),
 	        Txt_Eliminating_X_users_who_were_not_enroled_in_any_course_and_with_more_than_Y_months_without_access_to_Z,
@@ -2028,11 +2029,11 @@ void Enr_SignUpInCrs (void)
          Lay_ShowErrorAndExit ("Wrong role.");
 
       /***** Try to get and old request of the same user in the same course from database *****/
-      DB_BuildQuery ("SELECT ReqCod FROM crs_usr_requests"
-		     " WHERE CrsCod=%ld AND UsrCod=%ld",
-		     Gbl.CurrentCrs.Crs.CrsCod,
-		     Gbl.Usrs.Me.UsrDat.UsrCod);
-      if (DB_QuerySELECT_new (&mysql_res,"can not get enrolment request"))
+      if (DB_QuerySELECT (&mysql_res,"can not get enrolment request",
+			  "SELECT ReqCod FROM crs_usr_requests"
+			  " WHERE CrsCod=%ld AND UsrCod=%ld",
+			  Gbl.CurrentCrs.Crs.CrsCod,
+			  Gbl.Usrs.Me.UsrDat.UsrCod))
         {
          row = mysql_fetch_row (mysql_res);
          /* Get request code (row[0]) */
@@ -2098,11 +2099,11 @@ void Enr_GetNotifEnrolmentRequest (char SummaryStr[Ntf_MAX_BYTES_SUMMARY + 1],
    // This function may be called inside a web service, so don't report error
 
    /***** Get user and requested role from database *****/
-   DB_BuildQuery ("SELECT UsrCod,Role"
-		  " FROM crs_usr_requests"
-		  " WHERE ReqCod=%ld",
-                  ReqCod);
-   if (DB_QuerySELECT_new (&mysql_res,"can not get enrolment request") == 1)	// Result should have a unique row
+   if (DB_QuerySELECT (&mysql_res,"can not get enrolment request",
+		       "SELECT UsrCod,Role"
+		       " FROM crs_usr_requests"
+		       " WHERE ReqCod=%ld",
+		       ReqCod) == 1)	// Result should have a unique row
      {
       /***** Get user and requested role *****/
       row = mysql_fetch_row (mysql_res);
@@ -2304,8 +2305,8 @@ static void Enr_ShowEnrolmentRequestsGivenRoles (unsigned RolesSelected)
    extern const char *Txt_No_enrolment_requests;
    MYSQL_RES *mysql_res;
    MYSQL_ROW row;
-   unsigned NumReq;
-   unsigned NumRequests;
+   unsigned long NumReqs = 0;	// Initialized to avoid warning
+   unsigned long NumReq;
    long ReqCod;
    struct Degree Deg;
    struct Course Crs;
@@ -2377,83 +2378,93 @@ static void Enr_ShowEnrolmentRequestsGivenRoles (unsigned RolesSelected)
            {
             case Rol_TCH:
                // Requests in all courses in which I am teacher
-               DB_BuildQuery ("SELECT crs_usr_requests.ReqCod,"
-			      "crs_usr_requests.CrsCod,"
-			      "crs_usr_requests.UsrCod,"
-			      "crs_usr_requests.Role,"
-			      "UNIX_TIMESTAMP(crs_usr_requests.RequestTime)"
-			      " FROM crs_usr,crs_usr_requests"
-			      " WHERE crs_usr.UsrCod=%ld"
-			      " AND crs_usr.Role=%u"
-			      " AND crs_usr.CrsCod=crs_usr_requests.CrsCod"
-			      " AND ((1<<crs_usr_requests.Role)&%u)<>0"
-			      " ORDER BY crs_usr_requests.RequestTime DESC",
-			      Gbl.Usrs.Me.UsrDat.UsrCod,
-			      (unsigned) Rol_TCH,
-			      RolesSelected);
+               NumReqs = DB_QuerySELECT (&mysql_res,"can not get requests"
+						    " for enrolment",
+					 "SELECT crs_usr_requests.ReqCod,"
+					 "crs_usr_requests.CrsCod,"
+					 "crs_usr_requests.UsrCod,"
+					 "crs_usr_requests.Role,"
+					 "UNIX_TIMESTAMP(crs_usr_requests.RequestTime)"
+					 " FROM crs_usr,crs_usr_requests"
+					 " WHERE crs_usr.UsrCod=%ld"
+					 " AND crs_usr.Role=%u"
+					 " AND crs_usr.CrsCod=crs_usr_requests.CrsCod"
+					 " AND ((1<<crs_usr_requests.Role)&%u)<>0"
+					 " ORDER BY crs_usr_requests.RequestTime DESC",
+					 Gbl.Usrs.Me.UsrDat.UsrCod,
+					 (unsigned) Rol_TCH,
+					 RolesSelected);
                break;
             case Rol_DEG_ADM:
                // Requests in all degrees administrated by me
-               DB_BuildQuery ("SELECT crs_usr_requests.ReqCod,"
-			      "crs_usr_requests.CrsCod,"
-			      "crs_usr_requests.UsrCod,"
-			      "crs_usr_requests.Role,"
-			      "UNIX_TIMESTAMP(crs_usr_requests.RequestTime)"
-			      " FROM admin,courses,crs_usr_requests"
-			      " WHERE admin.UsrCod=%ld AND admin.Scope='%s'"
-			      " AND admin.Cod=courses.DegCod"
-			      " AND courses.CrsCod=crs_usr_requests.CrsCod"
-			      " AND ((1<<crs_usr_requests.Role)&%u)<>0"
-			      " ORDER BY crs_usr_requests.RequestTime DESC",
-                              Gbl.Usrs.Me.UsrDat.UsrCod,Sco_ScopeDB[Sco_SCOPE_DEG],
-                              RolesSelected);
+               NumReqs = DB_QuerySELECT (&mysql_res,"can not get requests"
+						    " for enrolment",
+					 "SELECT crs_usr_requests.ReqCod,"
+					 "crs_usr_requests.CrsCod,"
+					 "crs_usr_requests.UsrCod,"
+					 "crs_usr_requests.Role,"
+					 "UNIX_TIMESTAMP(crs_usr_requests.RequestTime)"
+					 " FROM admin,courses,crs_usr_requests"
+					 " WHERE admin.UsrCod=%ld AND admin.Scope='%s'"
+					 " AND admin.Cod=courses.DegCod"
+					 " AND courses.CrsCod=crs_usr_requests.CrsCod"
+					 " AND ((1<<crs_usr_requests.Role)&%u)<>0"
+					 " ORDER BY crs_usr_requests.RequestTime DESC",
+					 Gbl.Usrs.Me.UsrDat.UsrCod,Sco_ScopeDB[Sco_SCOPE_DEG],
+					 RolesSelected);
                break;
             case Rol_CTR_ADM:
                // Requests in all centres administrated by me
-               DB_BuildQuery ("SELECT crs_usr_requests.ReqCod,"
-			      "crs_usr_requests.CrsCod,"
-			      "crs_usr_requests.UsrCod,"
-			      "crs_usr_requests.Role,"
-			      "UNIX_TIMESTAMP(crs_usr_requests.RequestTime)"
-			      " FROM admin,degrees,courses,crs_usr_requests"
-			      " WHERE admin.UsrCod=%ld AND admin.Scope='%s'"
-			      " AND admin.Cod=degrees.CtrCod"
-			      " AND degrees.DegCod=courses.DegCod"
-			      " AND courses.CrsCod=crs_usr_requests.CrsCod"
-			      " AND ((1<<crs_usr_requests.Role)&%u)<>0"
-			      " ORDER BY crs_usr_requests.RequestTime DESC",
-                              Gbl.Usrs.Me.UsrDat.UsrCod,Sco_ScopeDB[Sco_SCOPE_CTR],
-                              RolesSelected);
+               NumReqs = DB_QuerySELECT (&mysql_res,"can not get requests"
+						    " for enrolment",
+					 "SELECT crs_usr_requests.ReqCod,"
+					 "crs_usr_requests.CrsCod,"
+					 "crs_usr_requests.UsrCod,"
+					 "crs_usr_requests.Role,"
+					 "UNIX_TIMESTAMP(crs_usr_requests.RequestTime)"
+					 " FROM admin,degrees,courses,crs_usr_requests"
+					 " WHERE admin.UsrCod=%ld AND admin.Scope='%s'"
+					 " AND admin.Cod=degrees.CtrCod"
+					 " AND degrees.DegCod=courses.DegCod"
+					 " AND courses.CrsCod=crs_usr_requests.CrsCod"
+					 " AND ((1<<crs_usr_requests.Role)&%u)<>0"
+					 " ORDER BY crs_usr_requests.RequestTime DESC",
+					 Gbl.Usrs.Me.UsrDat.UsrCod,Sco_ScopeDB[Sco_SCOPE_CTR],
+					 RolesSelected);
                break;
             case Rol_INS_ADM:
                // Requests in all institutions administrated by me
-               DB_BuildQuery ("SELECT crs_usr_requests.ReqCod,"
-			      "crs_usr_requests.CrsCod,"
-			      "crs_usr_requests.UsrCod,"
-			      "crs_usr_requests.Role,"
-			      "UNIX_TIMESTAMP(crs_usr_requests.RequestTime)"
-			      " FROM admin,centres,degrees,courses,crs_usr_requests"
-			      " WHERE admin.UsrCod=%ld AND admin.Scope='%s'"
-			      " AND admin.Cod=centres.InsCod"
-			      " AND centres.CtrCod=degrees.CtrCod"
-			      " AND degrees.DegCod=courses.DegCod"
-			      " AND courses.CrsCod=crs_usr_requests.CrsCod"
-			      " AND ((1<<crs_usr_requests.Role)&%u)<>0"
-			      " ORDER BY crs_usr_requests.RequestTime DESC",
-			      Gbl.Usrs.Me.UsrDat.UsrCod,Sco_ScopeDB[Sco_SCOPE_INS],
-			      RolesSelected);
+               NumReqs = DB_QuerySELECT (&mysql_res,"can not get requests"
+						    " for enrolment",
+					 "SELECT crs_usr_requests.ReqCod,"
+					 "crs_usr_requests.CrsCod,"
+					 "crs_usr_requests.UsrCod,"
+					 "crs_usr_requests.Role,"
+					 "UNIX_TIMESTAMP(crs_usr_requests.RequestTime)"
+					 " FROM admin,centres,degrees,courses,crs_usr_requests"
+					 " WHERE admin.UsrCod=%ld AND admin.Scope='%s'"
+					 " AND admin.Cod=centres.InsCod"
+					 " AND centres.CtrCod=degrees.CtrCod"
+					 " AND degrees.DegCod=courses.DegCod"
+					 " AND courses.CrsCod=crs_usr_requests.CrsCod"
+					 " AND ((1<<crs_usr_requests.Role)&%u)<>0"
+					 " ORDER BY crs_usr_requests.RequestTime DESC",
+					 Gbl.Usrs.Me.UsrDat.UsrCod,Sco_ScopeDB[Sco_SCOPE_INS],
+					 RolesSelected);
                break;
            case Rol_SYS_ADM:
                // All requests
-               DB_BuildQuery ("SELECT ReqCod,"
-			      "CrsCod,"
-			      "UsrCod,"
-			      "Role,"
-			      "UNIX_TIMESTAMP(RequestTime)"
-			      " FROM crs_usr_requests"
-			      " WHERE ((1<<Role)&%u)<>0"
-			      " ORDER BY RequestTime DESC",
-                              RolesSelected);
+               NumReqs = DB_QuerySELECT (&mysql_res,"can not get requests"
+						    " for enrolment",
+					 "SELECT ReqCod,"
+					 "CrsCod,"
+					 "UsrCod,"
+					 "Role,"
+					 "UNIX_TIMESTAMP(RequestTime)"
+					 " FROM crs_usr_requests"
+					 " WHERE ((1<<Role)&%u)<>0"
+					 " ORDER BY RequestTime DESC",
+					 RolesSelected);
                break;
             default:
                Lay_ShowErrorAndExit ("You don't have permission to list requesters.");
@@ -2465,107 +2476,117 @@ static void Enr_ShowEnrolmentRequestsGivenRoles (unsigned RolesSelected)
            {
             case Rol_TCH:
                // Requests in courses of this country in which I am teacher
-               DB_BuildQuery ("SELECT crs_usr_requests.ReqCod,"
-			      "crs_usr_requests.CrsCod,"
-			      "crs_usr_requests.UsrCod,"
-			      "crs_usr_requests.Role,"
-			      "UNIX_TIMESTAMP(crs_usr_requests.RequestTime)"
-			      " FROM crs_usr,institutions,centres,degrees,courses,crs_usr_requests"
-			      " WHERE crs_usr.UsrCod=%ld"
-			      " AND crs_usr.Role=%u"
-			      " AND crs_usr.CrsCod=courses.CrsCod"
-			      " AND courses.DegCod=degrees.DegCod"
-			      " AND degrees.CtrCod=centres.CtrCod"
-			      " AND centres.InsCod=institutions.InsCod"
-			      " AND institutions.CtyCod=%ld"
-			      " AND courses.CrsCod=crs_usr_requests.CrsCod"
-			      " AND ((1<<crs_usr_requests.Role)&%u)<>0"
-			      " ORDER BY crs_usr_requests.RequestTime DESC",
-			      Gbl.Usrs.Me.UsrDat.UsrCod,
-			      (unsigned) Rol_TCH,
-			      Gbl.CurrentCty.Cty.CtyCod,
-			      RolesSelected);
+               NumReqs = DB_QuerySELECT (&mysql_res,"can not get requests"
+						    " for enrolment",
+					 "SELECT crs_usr_requests.ReqCod,"
+					 "crs_usr_requests.CrsCod,"
+					 "crs_usr_requests.UsrCod,"
+					 "crs_usr_requests.Role,"
+					 "UNIX_TIMESTAMP(crs_usr_requests.RequestTime)"
+					 " FROM crs_usr,institutions,centres,degrees,courses,crs_usr_requests"
+					 " WHERE crs_usr.UsrCod=%ld"
+					 " AND crs_usr.Role=%u"
+					 " AND crs_usr.CrsCod=courses.CrsCod"
+					 " AND courses.DegCod=degrees.DegCod"
+					 " AND degrees.CtrCod=centres.CtrCod"
+					 " AND centres.InsCod=institutions.InsCod"
+					 " AND institutions.CtyCod=%ld"
+					 " AND courses.CrsCod=crs_usr_requests.CrsCod"
+					 " AND ((1<<crs_usr_requests.Role)&%u)<>0"
+					 " ORDER BY crs_usr_requests.RequestTime DESC",
+					 Gbl.Usrs.Me.UsrDat.UsrCod,
+					 (unsigned) Rol_TCH,
+					 Gbl.CurrentCty.Cty.CtyCod,
+					 RolesSelected);
                break;
             case Rol_DEG_ADM:
                // Requests in degrees of this country administrated by me
-               DB_BuildQuery ("SELECT crs_usr_requests.ReqCod,"
-			      "crs_usr_requests.CrsCod,"
-			      "crs_usr_requests.UsrCod,"
-			      "crs_usr_requests.Role,"
-			      "UNIX_TIMESTAMP(crs_usr_requests.RequestTime)"
-			      " FROM admin,institutions,centres,degrees,courses,crs_usr_requests"
-			      " WHERE admin.UsrCod=%ld AND admin.Scope='%s'"
-			      " AND admin.Cod=degrees.DegCod"
-			      " AND degrees.CtrCod=centres.CtrCod"
-			      " AND centres.InsCod=institutions.InsCod"
-			      " AND institutions.CtyCod=%ld"
-			      " AND degrees.DegCod=courses.DegCod"
-			      " AND courses.CrsCod=crs_usr_requests.CrsCod"
-			      " AND ((1<<crs_usr_requests.Role)&%u)<>0"
-			      " ORDER BY crs_usr_requests.RequestTime DESC",
-			      Gbl.Usrs.Me.UsrDat.UsrCod,Sco_ScopeDB[Sco_SCOPE_DEG],
-			      Gbl.CurrentCty.Cty.CtyCod,
-			      RolesSelected);
+               NumReqs = DB_QuerySELECT (&mysql_res,"can not get requests"
+						    " for enrolment",
+					 "SELECT crs_usr_requests.ReqCod,"
+					 "crs_usr_requests.CrsCod,"
+					 "crs_usr_requests.UsrCod,"
+					 "crs_usr_requests.Role,"
+					 "UNIX_TIMESTAMP(crs_usr_requests.RequestTime)"
+					 " FROM admin,institutions,centres,degrees,courses,crs_usr_requests"
+					 " WHERE admin.UsrCod=%ld AND admin.Scope='%s'"
+					 " AND admin.Cod=degrees.DegCod"
+					 " AND degrees.CtrCod=centres.CtrCod"
+					 " AND centres.InsCod=institutions.InsCod"
+					 " AND institutions.CtyCod=%ld"
+					 " AND degrees.DegCod=courses.DegCod"
+					 " AND courses.CrsCod=crs_usr_requests.CrsCod"
+					 " AND ((1<<crs_usr_requests.Role)&%u)<>0"
+					 " ORDER BY crs_usr_requests.RequestTime DESC",
+					 Gbl.Usrs.Me.UsrDat.UsrCod,Sco_ScopeDB[Sco_SCOPE_DEG],
+					 Gbl.CurrentCty.Cty.CtyCod,
+					 RolesSelected);
                break;
             case Rol_CTR_ADM:
                // Requests in centres of this country administrated by me
-               DB_BuildQuery ("SELECT crs_usr_requests.ReqCod,"
-			      "crs_usr_requests.CrsCod,"
-			      "crs_usr_requests.UsrCod,"
-			      "crs_usr_requests.Role,"
-			      "UNIX_TIMESTAMP(crs_usr_requests.RequestTime)"
-			      " FROM admin,institutions,centres,degrees,courses,crs_usr_requests"
-			      " WHERE admin.UsrCod=%ld AND admin.Scope='%s'"
-			      " AND admin.Cod=centres.CtrCod"
-			      " AND centres.InsCod=institutions.InsCod"
-			      " AND institutions.CtyCod=%ld"
-			      " AND centres.CtrCod=degrees.CtrCod"
-			      " AND degrees.DegCod=courses.DegCod"
-			      " AND courses.CrsCod=crs_usr_requests.CrsCod"
-			      " AND ((1<<crs_usr_requests.Role)&%u)<>0"
-			      " ORDER BY crs_usr_requests.RequestTime DESC",
-                              Gbl.Usrs.Me.UsrDat.UsrCod,Sco_ScopeDB[Sco_SCOPE_CTR],
-                              Gbl.CurrentCty.Cty.CtyCod,
-                              RolesSelected);
+               NumReqs = DB_QuerySELECT (&mysql_res,"can not get requests"
+						    " for enrolment",
+					 "SELECT crs_usr_requests.ReqCod,"
+					 "crs_usr_requests.CrsCod,"
+					 "crs_usr_requests.UsrCod,"
+					 "crs_usr_requests.Role,"
+					 "UNIX_TIMESTAMP(crs_usr_requests.RequestTime)"
+					 " FROM admin,institutions,centres,degrees,courses,crs_usr_requests"
+					 " WHERE admin.UsrCod=%ld AND admin.Scope='%s'"
+					 " AND admin.Cod=centres.CtrCod"
+					 " AND centres.InsCod=institutions.InsCod"
+					 " AND institutions.CtyCod=%ld"
+					 " AND centres.CtrCod=degrees.CtrCod"
+					 " AND degrees.DegCod=courses.DegCod"
+					 " AND courses.CrsCod=crs_usr_requests.CrsCod"
+					 " AND ((1<<crs_usr_requests.Role)&%u)<>0"
+					 " ORDER BY crs_usr_requests.RequestTime DESC",
+					 Gbl.Usrs.Me.UsrDat.UsrCod,Sco_ScopeDB[Sco_SCOPE_CTR],
+					 Gbl.CurrentCty.Cty.CtyCod,
+					 RolesSelected);
                break;
             case Rol_INS_ADM:
                // Requests in institutions of this country administrated by me
-               DB_BuildQuery ("SELECT crs_usr_requests.ReqCod,"
-			      "crs_usr_requests.CrsCod,"
-			      "crs_usr_requests.UsrCod,"
-			      "crs_usr_requests.Role,"
-			      "UNIX_TIMESTAMP(crs_usr_requests.RequestTime)"
-			      " FROM admin,institutions,centres,degrees,courses,crs_usr_requests"
-			      " WHERE admin.UsrCod=%ld AND admin.Scope='%s'"
-			      " AND admin.Cod=institutions.InsCod"
-			      " AND institutions.CtyCod=%ld"
-			      " AND institutions.InsCod=centres.InsCod"
-			      " AND centres.CtrCod=degrees.CtrCod"
-			      " AND degrees.DegCod=courses.DegCod"
-			      " AND courses.CrsCod=crs_usr_requests.CrsCod"
-			      " AND ((1<<crs_usr_requests.Role)&%u)<>0"
-			      " ORDER BY crs_usr_requests.RequestTime DESC",
-			      Gbl.Usrs.Me.UsrDat.UsrCod,Sco_ScopeDB[Sco_SCOPE_INS],
-			      Gbl.CurrentCty.Cty.CtyCod,
-			      RolesSelected);
+               NumReqs = DB_QuerySELECT (&mysql_res,"can not get requests"
+						    " for enrolment",
+					 "SELECT crs_usr_requests.ReqCod,"
+					 "crs_usr_requests.CrsCod,"
+					 "crs_usr_requests.UsrCod,"
+					 "crs_usr_requests.Role,"
+					 "UNIX_TIMESTAMP(crs_usr_requests.RequestTime)"
+					 " FROM admin,institutions,centres,degrees,courses,crs_usr_requests"
+					 " WHERE admin.UsrCod=%ld AND admin.Scope='%s'"
+					 " AND admin.Cod=institutions.InsCod"
+					 " AND institutions.CtyCod=%ld"
+					 " AND institutions.InsCod=centres.InsCod"
+					 " AND centres.CtrCod=degrees.CtrCod"
+					 " AND degrees.DegCod=courses.DegCod"
+					 " AND courses.CrsCod=crs_usr_requests.CrsCod"
+					 " AND ((1<<crs_usr_requests.Role)&%u)<>0"
+					 " ORDER BY crs_usr_requests.RequestTime DESC",
+					 Gbl.Usrs.Me.UsrDat.UsrCod,Sco_ScopeDB[Sco_SCOPE_INS],
+					 Gbl.CurrentCty.Cty.CtyCod,
+					 RolesSelected);
                break;
             case Rol_SYS_ADM:
                // Requests in any course of this country
-               DB_BuildQuery ("SELECT crs_usr_requests.ReqCod,"
-			      "crs_usr_requests.CrsCod,"
-			      "crs_usr_requests.UsrCod,"
-			      "crs_usr_requests.Role,"
-			      "UNIX_TIMESTAMP(crs_usr_requests.RequestTime)"
-			      " FROM institutions,centres,degrees,courses,crs_usr_requests"
-			      " WHERE institutions.CtyCod=%ld"
-			      " AND institutions.InsCod=centres.InsCod"
-			      " AND centres.CtrCod=degrees.CtrCod"
-			      " AND degrees.DegCod=courses.DegCod"
-			      " AND courses.CrsCod=crs_usr_requests.CrsCod"
-			      " AND ((1<<crs_usr_requests.Role)&%u)<>0"
-			      " ORDER BY crs_usr_requests.RequestTime DESC",
-                              Gbl.CurrentCty.Cty.CtyCod,
-                              RolesSelected);
+               NumReqs = DB_QuerySELECT (&mysql_res,"can not get requests"
+						    " for enrolment",
+					 "SELECT crs_usr_requests.ReqCod,"
+					 "crs_usr_requests.CrsCod,"
+					 "crs_usr_requests.UsrCod,"
+					 "crs_usr_requests.Role,"
+					 "UNIX_TIMESTAMP(crs_usr_requests.RequestTime)"
+					 " FROM institutions,centres,degrees,courses,crs_usr_requests"
+					 " WHERE institutions.CtyCod=%ld"
+					 " AND institutions.InsCod=centres.InsCod"
+					 " AND centres.CtrCod=degrees.CtrCod"
+					 " AND degrees.DegCod=courses.DegCod"
+					 " AND courses.CrsCod=crs_usr_requests.CrsCod"
+					 " AND ((1<<crs_usr_requests.Role)&%u)<>0"
+					 " ORDER BY crs_usr_requests.RequestTime DESC",
+					 Gbl.CurrentCty.Cty.CtyCod,
+					 RolesSelected);
                break;
             default:
                Lay_ShowErrorAndExit ("You don't have permission to list requesters.");
@@ -2577,83 +2598,91 @@ static void Enr_ShowEnrolmentRequestsGivenRoles (unsigned RolesSelected)
            {
             case Rol_TCH:
                // Requests in courses of this institution in which I am teacher
-               DB_BuildQuery ("SELECT crs_usr_requests.ReqCod,"
-			      "crs_usr_requests.CrsCod,"
-			      "crs_usr_requests.UsrCod,"
-			      "crs_usr_requests.Role,"
-			      "UNIX_TIMESTAMP(crs_usr_requests.RequestTime)"
-			      " FROM crs_usr,centres,degrees,courses,crs_usr_requests"
-			      " WHERE crs_usr.UsrCod=%ld"
-			      " AND crs_usr.Role=%u"
-			      " AND crs_usr.CrsCod=courses.CrsCod"
-			      " AND courses.DegCod=degrees.DegCod"
-			      " AND degrees.CtrCod=centres.CtrCod"
-			      " AND centres.InsCod=%ld"
-			      " AND courses.CrsCod=crs_usr_requests.CrsCod"
-			      " AND ((1<<crs_usr_requests.Role)&%u)<>0"
-			      " ORDER BY crs_usr_requests.RequestTime DESC",
-			      Gbl.Usrs.Me.UsrDat.UsrCod,
-			      (unsigned) Rol_TCH,
-			      Gbl.CurrentIns.Ins.InsCod,
-			      RolesSelected);
+               NumReqs = DB_QuerySELECT (&mysql_res,"can not get requests"
+						    " for enrolment",
+					 "SELECT crs_usr_requests.ReqCod,"
+					 "crs_usr_requests.CrsCod,"
+					 "crs_usr_requests.UsrCod,"
+					 "crs_usr_requests.Role,"
+					 "UNIX_TIMESTAMP(crs_usr_requests.RequestTime)"
+					 " FROM crs_usr,centres,degrees,courses,crs_usr_requests"
+					 " WHERE crs_usr.UsrCod=%ld"
+					 " AND crs_usr.Role=%u"
+					 " AND crs_usr.CrsCod=courses.CrsCod"
+					 " AND courses.DegCod=degrees.DegCod"
+					 " AND degrees.CtrCod=centres.CtrCod"
+					 " AND centres.InsCod=%ld"
+					 " AND courses.CrsCod=crs_usr_requests.CrsCod"
+					 " AND ((1<<crs_usr_requests.Role)&%u)<>0"
+					 " ORDER BY crs_usr_requests.RequestTime DESC",
+					 Gbl.Usrs.Me.UsrDat.UsrCod,
+					 (unsigned) Rol_TCH,
+					 Gbl.CurrentIns.Ins.InsCod,
+					 RolesSelected);
                break;
             case Rol_DEG_ADM:
                // Requests in degrees of this institution administrated by me
-               DB_BuildQuery ("SELECT crs_usr_requests.ReqCod,"
-			      "crs_usr_requests.CrsCod,"
-			      "crs_usr_requests.UsrCod,"
-			      "crs_usr_requests.Role,"
-			      "UNIX_TIMESTAMP(crs_usr_requests.RequestTime)"
-			      " FROM admin,centres,degrees,courses,crs_usr_requests"
-			      " WHERE admin.UsrCod=%ld AND admin.Scope='%s'"
-			      " AND admin.Cod=degrees.DegCod"
-			      " AND degrees.CtrCod=centres.CtrCod"
-			      " AND centres.InsCod=%ld"
-			      " AND degrees.DegCod=courses.DegCod"
-			      " AND courses.CrsCod=crs_usr_requests.CrsCod"
-			      " AND ((1<<crs_usr_requests.Role)&%u)<>0"
-			      " ORDER BY crs_usr_requests.RequestTime DESC",
-			     Gbl.Usrs.Me.UsrDat.UsrCod,Sco_ScopeDB[Sco_SCOPE_DEG],
-			     Gbl.CurrentIns.Ins.InsCod,
-			     RolesSelected);
+               NumReqs = DB_QuerySELECT (&mysql_res,"can not get requests"
+						    " for enrolment",
+					 "SELECT crs_usr_requests.ReqCod,"
+					 "crs_usr_requests.CrsCod,"
+					 "crs_usr_requests.UsrCod,"
+					 "crs_usr_requests.Role,"
+					 "UNIX_TIMESTAMP(crs_usr_requests.RequestTime)"
+					 " FROM admin,centres,degrees,courses,crs_usr_requests"
+					 " WHERE admin.UsrCod=%ld AND admin.Scope='%s'"
+					 " AND admin.Cod=degrees.DegCod"
+					 " AND degrees.CtrCod=centres.CtrCod"
+					 " AND centres.InsCod=%ld"
+					 " AND degrees.DegCod=courses.DegCod"
+					 " AND courses.CrsCod=crs_usr_requests.CrsCod"
+					 " AND ((1<<crs_usr_requests.Role)&%u)<>0"
+					 " ORDER BY crs_usr_requests.RequestTime DESC",
+					 Gbl.Usrs.Me.UsrDat.UsrCod,Sco_ScopeDB[Sco_SCOPE_DEG],
+					 Gbl.CurrentIns.Ins.InsCod,
+					 RolesSelected);
                break;
             case Rol_CTR_ADM:
                // Requests in centres of this institution administrated by me
-               DB_BuildQuery ("SELECT crs_usr_requests.ReqCod,"
-			      "crs_usr_requests.CrsCod,"
-			      "crs_usr_requests.UsrCod,"
-			      "crs_usr_requests.Role,"
-			      "UNIX_TIMESTAMP(crs_usr_requests.RequestTime)"
-			      " FROM admin,centres,degrees,courses,crs_usr_requests"
-			      " WHERE admin.UsrCod=%ld AND admin.Scope='%s'"
-			      " AND admin.Cod=centres.CtrCod"
-			      " AND centres.InsCod=%ld"
-			      " AND centres.CtrCod=degrees.CtrCod"
-			      " AND degrees.DegCod=courses.DegCod"
-			      " AND courses.CrsCod=crs_usr_requests.CrsCod"
-			      " AND ((1<<crs_usr_requests.Role)&%u)<>0"
-			      " ORDER BY crs_usr_requests.RequestTime DESC",
-			     Gbl.Usrs.Me.UsrDat.UsrCod,Sco_ScopeDB[Sco_SCOPE_CTR],
-			     Gbl.CurrentIns.Ins.InsCod,
-			     RolesSelected);
+               NumReqs = DB_QuerySELECT (&mysql_res,"can not get requests"
+						    " for enrolment",
+					 "SELECT crs_usr_requests.ReqCod,"
+					 "crs_usr_requests.CrsCod,"
+					 "crs_usr_requests.UsrCod,"
+					 "crs_usr_requests.Role,"
+					 "UNIX_TIMESTAMP(crs_usr_requests.RequestTime)"
+					 " FROM admin,centres,degrees,courses,crs_usr_requests"
+					 " WHERE admin.UsrCod=%ld AND admin.Scope='%s'"
+					 " AND admin.Cod=centres.CtrCod"
+					 " AND centres.InsCod=%ld"
+					 " AND centres.CtrCod=degrees.CtrCod"
+					 " AND degrees.DegCod=courses.DegCod"
+					 " AND courses.CrsCod=crs_usr_requests.CrsCod"
+					 " AND ((1<<crs_usr_requests.Role)&%u)<>0"
+					 " ORDER BY crs_usr_requests.RequestTime DESC",
+					 Gbl.Usrs.Me.UsrDat.UsrCod,Sco_ScopeDB[Sco_SCOPE_CTR],
+					 Gbl.CurrentIns.Ins.InsCod,
+					 RolesSelected);
                break;
             case Rol_INS_ADM:	// If I am logged as admin of this institution, I can view all the requesters from this institution
             case Rol_SYS_ADM:
                // Requests in any course of this institution
-               DB_BuildQuery ("SELECT crs_usr_requests.ReqCod,"
-			      "crs_usr_requests.CrsCod,"
-			      "crs_usr_requests.UsrCod,"
-			      "crs_usr_requests.Role,"
-			      "UNIX_TIMESTAMP(crs_usr_requests.RequestTime)"
-			      " FROM centres,degrees,courses,crs_usr_requests"
-			      " WHERE centres.InsCod=%ld"
-			      " AND centres.CtrCod=degrees.CtrCod"
-			      " AND degrees.DegCod=courses.DegCod"
-			      " AND courses.CrsCod=crs_usr_requests.CrsCod"
-			      " AND ((1<<crs_usr_requests.Role)&%u)<>0"
-			      " ORDER BY crs_usr_requests.RequestTime DESC",
-			      Gbl.CurrentIns.Ins.InsCod,
-			      RolesSelected);
+               NumReqs = DB_QuerySELECT (&mysql_res,"can not get requests"
+						    " for enrolment",
+					 "SELECT crs_usr_requests.ReqCod,"
+					 "crs_usr_requests.CrsCod,"
+					 "crs_usr_requests.UsrCod,"
+					 "crs_usr_requests.Role,"
+					 "UNIX_TIMESTAMP(crs_usr_requests.RequestTime)"
+					 " FROM centres,degrees,courses,crs_usr_requests"
+					 " WHERE centres.InsCod=%ld"
+					 " AND centres.CtrCod=degrees.CtrCod"
+					 " AND degrees.DegCod=courses.DegCod"
+					 " AND courses.CrsCod=crs_usr_requests.CrsCod"
+					 " AND ((1<<crs_usr_requests.Role)&%u)<>0"
+					 " ORDER BY crs_usr_requests.RequestTime DESC",
+					 Gbl.CurrentIns.Ins.InsCod,
+					 RolesSelected);
                break;
             default:
                Lay_ShowErrorAndExit ("You don't have permission to list requesters.");
@@ -2665,61 +2694,67 @@ static void Enr_ShowEnrolmentRequestsGivenRoles (unsigned RolesSelected)
            {
             case Rol_TCH:
                // Requests in courses of this centre in which I am teacher
-               DB_BuildQuery ("SELECT crs_usr_requests.ReqCod,"
-			      "crs_usr_requests.CrsCod,"
-			      "crs_usr_requests.UsrCod,"
-			      "crs_usr_requests.Role,"
-			      "UNIX_TIMESTAMP(crs_usr_requests.RequestTime)"
-			      " FROM crs_usr,degrees,courses,crs_usr_requests"
-			      " WHERE crs_usr.UsrCod=%ld"
-			      " AND crs_usr.Role=%u"
-			      " AND crs_usr.CrsCod=courses.CrsCod"
-			      " AND courses.DegCod=degrees.DegCod"
-			      " AND degrees.CtrCod=%ld"
-			      " AND courses.CrsCod=crs_usr_requests.CrsCod"
-			      " AND ((1<<crs_usr_requests.Role)&%u)<>0"
-			      " ORDER BY crs_usr_requests.RequestTime DESC",
-			     Gbl.Usrs.Me.UsrDat.UsrCod,
-			     (unsigned) Rol_TCH,
-			     Gbl.CurrentCtr.Ctr.CtrCod,
-			     RolesSelected);
+               NumReqs = DB_QuerySELECT (&mysql_res,"can not get requests"
+						    " for enrolment",
+					 "SELECT crs_usr_requests.ReqCod,"
+					 "crs_usr_requests.CrsCod,"
+					 "crs_usr_requests.UsrCod,"
+					 "crs_usr_requests.Role,"
+					 "UNIX_TIMESTAMP(crs_usr_requests.RequestTime)"
+					 " FROM crs_usr,degrees,courses,crs_usr_requests"
+					 " WHERE crs_usr.UsrCod=%ld"
+					 " AND crs_usr.Role=%u"
+					 " AND crs_usr.CrsCod=courses.CrsCod"
+					 " AND courses.DegCod=degrees.DegCod"
+					 " AND degrees.CtrCod=%ld"
+					 " AND courses.CrsCod=crs_usr_requests.CrsCod"
+					 " AND ((1<<crs_usr_requests.Role)&%u)<>0"
+					 " ORDER BY crs_usr_requests.RequestTime DESC",
+					 Gbl.Usrs.Me.UsrDat.UsrCod,
+					 (unsigned) Rol_TCH,
+					 Gbl.CurrentCtr.Ctr.CtrCod,
+					 RolesSelected);
                break;
             case Rol_DEG_ADM:
                // Requests in degrees of this centre administrated by me
-               DB_BuildQuery ("SELECT crs_usr_requests.ReqCod,"
-			      "crs_usr_requests.CrsCod,"
-			      "crs_usr_requests.UsrCod,"
-			      "crs_usr_requests.Role,"
-			      "UNIX_TIMESTAMP(crs_usr_requests.RequestTime)"
-			      " FROM admin,degrees,courses,crs_usr_requests"
-			      " WHERE admin.UsrCod=%ld AND admin.Scope='%s'"
-			      " AND admin.Cod=degrees.DegCod"
-			      " AND degrees.CtrCod=%ld"
-			      " AND degrees.DegCod=courses.DegCod"
-			      " AND courses.CrsCod=crs_usr_requests.CrsCod"
-			      " AND ((1<<crs_usr_requests.Role)&%u)<>0"
-			      " ORDER BY crs_usr_requests.RequestTime DESC",
-			      Gbl.Usrs.Me.UsrDat.UsrCod,Sco_ScopeDB[Sco_SCOPE_DEG],
-			      Gbl.CurrentCtr.Ctr.CtrCod,
-			      RolesSelected);
+               NumReqs = DB_QuerySELECT (&mysql_res,"can not get requests"
+						    " for enrolment",
+					 "SELECT crs_usr_requests.ReqCod,"
+					 "crs_usr_requests.CrsCod,"
+					 "crs_usr_requests.UsrCod,"
+					 "crs_usr_requests.Role,"
+					 "UNIX_TIMESTAMP(crs_usr_requests.RequestTime)"
+					 " FROM admin,degrees,courses,crs_usr_requests"
+					 " WHERE admin.UsrCod=%ld AND admin.Scope='%s'"
+					 " AND admin.Cod=degrees.DegCod"
+					 " AND degrees.CtrCod=%ld"
+					 " AND degrees.DegCod=courses.DegCod"
+					 " AND courses.CrsCod=crs_usr_requests.CrsCod"
+					 " AND ((1<<crs_usr_requests.Role)&%u)<>0"
+					 " ORDER BY crs_usr_requests.RequestTime DESC",
+					 Gbl.Usrs.Me.UsrDat.UsrCod,Sco_ScopeDB[Sco_SCOPE_DEG],
+					 Gbl.CurrentCtr.Ctr.CtrCod,
+					 RolesSelected);
                break;
             case Rol_CTR_ADM:	// If I am logged as admin of this centre     , I can view all the requesters from this centre
             case Rol_INS_ADM:	// If I am logged as admin of this institution, I can view all the requesters from this centre
             case Rol_SYS_ADM:
                // Request in any course of this centre
-               DB_BuildQuery ("SELECT crs_usr_requests.ReqCod,"
-			      "crs_usr_requests.CrsCod,"
-			      "crs_usr_requests.UsrCod,"
-			      "crs_usr_requests.Role,"
-			      "UNIX_TIMESTAMP(crs_usr_requests.RequestTime)"
-			      " FROM degrees,courses,crs_usr_requests"
-			      " WHERE degrees.CtrCod=%ld"
-			      " AND degrees.DegCod=courses.DegCod"
-			      " AND courses.CrsCod=crs_usr_requests.CrsCod"
-			      " AND ((1<<crs_usr_requests.Role)&%u)<>0"
-			      " ORDER BY crs_usr_requests.RequestTime DESC",
-                              Gbl.CurrentCtr.Ctr.CtrCod,
-                              RolesSelected);
+               NumReqs = DB_QuerySELECT (&mysql_res,"can not get requests"
+						    " for enrolment",
+					 "SELECT crs_usr_requests.ReqCod,"
+					 "crs_usr_requests.CrsCod,"
+					 "crs_usr_requests.UsrCod,"
+					 "crs_usr_requests.Role,"
+					 "UNIX_TIMESTAMP(crs_usr_requests.RequestTime)"
+					 " FROM degrees,courses,crs_usr_requests"
+					 " WHERE degrees.CtrCod=%ld"
+					 " AND degrees.DegCod=courses.DegCod"
+					 " AND courses.CrsCod=crs_usr_requests.CrsCod"
+					 " AND ((1<<crs_usr_requests.Role)&%u)<>0"
+					 " ORDER BY crs_usr_requests.RequestTime DESC",
+					 Gbl.CurrentCtr.Ctr.CtrCod,
+					 RolesSelected);
                break;
             default:
                Lay_ShowErrorAndExit ("You don't have permission to list requesters.");
@@ -2731,41 +2766,45 @@ static void Enr_ShowEnrolmentRequestsGivenRoles (unsigned RolesSelected)
            {
             case Rol_TCH:
                // Requests in courses of this degree in which I am teacher
-               DB_BuildQuery ("SELECT crs_usr_requests.ReqCod,"
-			      "crs_usr_requests.CrsCod,"
-			      "crs_usr_requests.UsrCod,"
-			      "crs_usr_requests.Role,"
-			      "UNIX_TIMESTAMP(crs_usr_requests.RequestTime)"
-			      " FROM crs_usr,courses,crs_usr_requests"
-			      " WHERE crs_usr.UsrCod=%ld"
-			      " AND crs_usr.Role=%u"
-			      " AND crs_usr.CrsCod=courses.CrsCod"
-			      " AND courses.DegCod=%ld"
-			      " AND courses.CrsCod=crs_usr_requests.CrsCod"
-			      " AND ((1<<crs_usr_requests.Role)&%u)<>0"
-			      " ORDER BY crs_usr_requests.RequestTime DESC",
-			     Gbl.Usrs.Me.UsrDat.UsrCod,
-			     (unsigned) Rol_TCH,
-			     Gbl.CurrentDeg.Deg.DegCod,
-			     RolesSelected);
+               NumReqs = DB_QuerySELECT (&mysql_res,"can not get requests"
+						    " for enrolment",
+					 "SELECT crs_usr_requests.ReqCod,"
+					 "crs_usr_requests.CrsCod,"
+					 "crs_usr_requests.UsrCod,"
+					 "crs_usr_requests.Role,"
+					 "UNIX_TIMESTAMP(crs_usr_requests.RequestTime)"
+					 " FROM crs_usr,courses,crs_usr_requests"
+					 " WHERE crs_usr.UsrCod=%ld"
+					 " AND crs_usr.Role=%u"
+					 " AND crs_usr.CrsCod=courses.CrsCod"
+					 " AND courses.DegCod=%ld"
+					 " AND courses.CrsCod=crs_usr_requests.CrsCod"
+					 " AND ((1<<crs_usr_requests.Role)&%u)<>0"
+					 " ORDER BY crs_usr_requests.RequestTime DESC",
+					 Gbl.Usrs.Me.UsrDat.UsrCod,
+					 (unsigned) Rol_TCH,
+					 Gbl.CurrentDeg.Deg.DegCod,
+					 RolesSelected);
                break;
             case Rol_DEG_ADM:	// If I am logged as admin of this degree     , I can view all the requesters from this degree
             case Rol_CTR_ADM:	// If I am logged as admin of this centre     , I can view all the requesters from this degree
             case Rol_INS_ADM:	// If I am logged as admin of this institution, I can view all the requesters from this degree
             case Rol_SYS_ADM:
                // Requests in any course of this degree
-               DB_BuildQuery ("SELECT crs_usr_requests.ReqCod,"
-			      "crs_usr_requests.CrsCod,"
-			      "crs_usr_requests.UsrCod,"
-			      "crs_usr_requests.Role,"
-			      "UNIX_TIMESTAMP(crs_usr_requests.RequestTime)"
-			      " FROM courses,crs_usr_requests"
-			      " WHERE courses.DegCod=%ld"
-			      " AND courses.CrsCod=crs_usr_requests.CrsCod"
-			      " AND ((1<<crs_usr_requests.Role)&%u)<>0"
-			      " ORDER BY crs_usr_requests.RequestTime DESC",
-			      Gbl.CurrentDeg.Deg.DegCod,
-			      RolesSelected);
+               NumReqs = DB_QuerySELECT (&mysql_res,"can not get requests"
+						    " for enrolment",
+					 "SELECT crs_usr_requests.ReqCod,"
+					 "crs_usr_requests.CrsCod,"
+					 "crs_usr_requests.UsrCod,"
+					 "crs_usr_requests.Role,"
+					 "UNIX_TIMESTAMP(crs_usr_requests.RequestTime)"
+					 " FROM courses,crs_usr_requests"
+					 " WHERE courses.DegCod=%ld"
+					 " AND courses.CrsCod=crs_usr_requests.CrsCod"
+					 " AND ((1<<crs_usr_requests.Role)&%u)<>0"
+					 " ORDER BY crs_usr_requests.RequestTime DESC",
+					 Gbl.CurrentDeg.Deg.DegCod,
+					 RolesSelected);
                break;
             default:
                Lay_ShowErrorAndExit ("You don't have permission to list requesters.");
@@ -2781,14 +2820,16 @@ static void Enr_ShowEnrolmentRequestsGivenRoles (unsigned RolesSelected)
             case Rol_INS_ADM:	// If I am logged as admin of this institution, I can view all the requesters from this course
             case Rol_SYS_ADM:
                // Requests in this course
-               DB_BuildQuery ("SELECT ReqCod,CrsCod,UsrCod,Role,"
-			      "UNIX_TIMESTAMP(RequestTime)"
-			      " FROM crs_usr_requests"
-			      " WHERE CrsCod=%ld"
-			      " AND ((1<<Role)&%u)<>0"
-			      " ORDER BY RequestTime DESC",
-			      Gbl.CurrentCrs.Crs.CrsCod,
-			      RolesSelected);
+               NumReqs = DB_QuerySELECT (&mysql_res,"can not get requests"
+						    " for enrolment",
+					 "SELECT ReqCod,CrsCod,UsrCod,Role,"
+					 "UNIX_TIMESTAMP(RequestTime)"
+					 " FROM crs_usr_requests"
+					 " WHERE CrsCod=%ld"
+					 " AND ((1<<Role)&%u)<>0"
+					 " ORDER BY RequestTime DESC",
+					 Gbl.CurrentCrs.Crs.CrsCod,
+					 RolesSelected);
                break;
             default:
                Lay_ShowErrorAndExit ("You don't have permission to list requesters.");
@@ -2800,10 +2841,8 @@ static void Enr_ShowEnrolmentRequestsGivenRoles (unsigned RolesSelected)
          break;
      }
 
-   NumRequests = (unsigned) DB_QuerySELECT_new (&mysql_res,"can not get requests for enrolment");
-
    /***** List requests *****/
-   if (NumRequests)
+   if (NumReqs)
       {
       /* Initialize structure with user's data */
       Usr_UsrDataConstructor (&UsrDat);
@@ -2837,7 +2876,7 @@ static void Enr_ShowEnrolmentRequestsGivenRoles (unsigned RolesSelected)
 
       /* List requests */
       for (NumReq = 0;
-           NumReq < NumRequests;
+           NumReq < NumReqs;
            NumReq++)
         {
          row = mysql_fetch_row (mysql_res);
@@ -2871,9 +2910,9 @@ static void Enr_ShowEnrolmentRequestsGivenRoles (unsigned RolesSelected)
             /***** Number *****/
             fprintf (Gbl.F.Out,"<tr>"
                                "<td class=\"DAT RIGHT_TOP\">"
-                               "%u"
+                               "%lu"
                                "</td>",
-                     NumRequests - NumReq);
+                     NumReqs - NumReq);
 
             /***** Link to course *****/
             Crs_GetDataOfCourseByCod (&Crs);
@@ -2993,10 +3032,10 @@ static void Enr_RemoveEnrolmentRequest (long CrsCod,long UsrCod)
    /***** Mark possible notifications as removed
           Important: do this before removing the request *****/
    /* Request request code (returns 0 or 1 rows) */
-   DB_BuildQuery ("SELECT ReqCod FROM crs_usr_requests"
-		  " WHERE CrsCod=%ld AND UsrCod=%ld",
-                  CrsCod,UsrCod);
-   if (DB_QuerySELECT_new (&mysql_res,"can not get request code"))        // Request exists
+   if (DB_QuerySELECT (&mysql_res,"can not get request code",
+		       "SELECT ReqCod FROM crs_usr_requests"
+		       " WHERE CrsCod=%ld AND UsrCod=%ld",
+                       CrsCod,UsrCod))        // Request exists
      {
       /* Get request code */
       row = mysql_fetch_row (mysql_res);
diff --git a/swad_search.c b/swad_search.c
index cd4cd0a97..166713234 100644
--- a/swad_search.c
+++ b/swad_search.c
@@ -728,6 +728,8 @@ static unsigned Sch_SearchCentresInDB (const char *RangeQuery)
 static unsigned Sch_SearchDegreesInDB (const char *RangeQuery)
   {
    char SearchQuery[Sch_MAX_BYTES_SEARCH_QUERY + 1];
+   MYSQL_RES *mysql_res;
+   unsigned NumDegs;
 
    /***** Check scope *****/
    if (Gbl.Scope.Current != Sco_SCOPE_CRS)
@@ -737,16 +739,18 @@ static unsigned Sch_SearchDegreesInDB (const char *RangeQuery)
 	 if (Sch_BuildSearchQuery (SearchQuery,"degrees.FullName",NULL,NULL))
 	   {
 	    /***** Query database and list degrees found *****/
-	    DB_BuildQuery ("SELECT degrees.DegCod"
-			   " FROM degrees,centres,institutions,countries"
-			   " WHERE %s"
-			   " AND degrees.CtrCod=centres.CtrCod"
-			   " AND centres.InsCod=institutions.InsCod"
-			   " AND institutions.CtyCod=countries.CtyCod"
-			   "%s"
-			   " ORDER BY degrees.FullName,institutions.FullName",
-		           SearchQuery,RangeQuery);
-	    return Deg_ListDegsFound ();
+	    NumDegs = (unsigned) DB_QuerySELECT (&mysql_res,"can not get degrees",
+						 "SELECT degrees.DegCod"
+						 " FROM degrees,centres,institutions,countries"
+						 " WHERE %s"
+						 " AND degrees.CtrCod=centres.CtrCod"
+						 " AND centres.InsCod=institutions.InsCod"
+						 " AND institutions.CtyCod=countries.CtyCod"
+						 "%s"
+						 " ORDER BY degrees.FullName,institutions.FullName",
+						 SearchQuery,RangeQuery);
+	    Deg_ListDegsFound (&mysql_res,NumDegs);
+	    return NumDegs;
 	   }
 
    return 0;