diff --git a/admin/index.php b/admin/index.php
index 825f02a..dd9eeb0 100644
--- a/admin/index.php
+++ b/admin/index.php
@@ -87,15 +87,10 @@ while($dsondage = $sondage->FetchNextObject(false)) {
     // On inclut la routine de suppression
     $date=date('H:i:s d/m/Y');
     
-    $req = 'DELETE s, su, u, c
-            FROM
-              sondage s LEFT JOIN sujet_studs su
-                ON su.id_sondage = s.id_sondage
-              LEFT JOIN user_studs u
-                ON u.id_sondage = s.id_sondage
-              LEFT JOIN comments c
-                ON c.id_sondage = s.id_sondage
-            WHERE s.id_sondage = '.$connect->Param('id_sondage');
+    $req = 'DELETE FROM sujet_studs WHERE id_sondage = ' . $connect->Param('id_sondage') . '; ' .
+           'DELETE FROM user_studs  WHERE id_sondage = ' . $connect->Param('id_sondage') . '; ' .
+           'DELETE FROM comments    WHERE id_sondage = ' . $connect->Param('id_sondage') . '; ' .
+           'DELETE FROM sondage     WHERE id_sondage = ' . $connect->Param('id_sondage') ;
     
     $sql = $connect->Prepare($req);
     $connect->Execute($sql, array($dsondage->id_sondage));
@@ -152,4 +147,4 @@ echo '</html>'."\n";
 
 // si on annule la suppression, rafraichissement de la page
 if (issetAndNoEmpty('annulesuppression') === true) {
-}
\ No newline at end of file
+}
diff --git a/adminstuds.php b/adminstuds.php
index a111504..808dd2d 100644
--- a/adminstuds.php
+++ b/adminstuds.php
@@ -314,15 +314,11 @@ if (isset($_POST["confirmesuppression"]) || isset($_POST["confirmesuppression_x"
   $date=date('H:i:s d/m/Y:');
 
   //destruction des données dans la base SQL
-  $sql = 'DELETE s, su, u, c
-          FROM
-            sondage s LEFT JOIN sujet_studs su
-              ON su.id_sondage = s.id_sondage
-            LEFT JOIN user_studs u
-              ON u.id_sondage = s.id_sondage
-            LEFT JOIN comments c
-              ON c.id_sondage = s.id_sondage
-          WHERE s.id_sondage = '.$connect->Param('numsondage');
+  $sql = 'DELETE FROM sujet_studs WHERE id_sondage = ' . $connect->Param('numsondage') . '; ' .
+         'DELETE FROM user_studs  WHERE id_sondage = ' . $connect->Param('numsondage') . '; ' .
+         'DELETE FROM comments    WHERE id_sondage = ' . $connect->Param('numsondage') . '; ' .
+         'DELETE FROM sondage     WHERE id_sondage = ' . $connect->Param('numsondage') ;
+
   $sql = $connect->Prepare($sql);
   if ($connect->Execute($sql, array($numsondage))) {
     // on ecrit dans le fichier de logs la suppression du sondage
@@ -1257,4 +1253,4 @@ echo '<div class="separateur">&nbsp;</div>';
 bandeau_pied_mobile();
 echo '</form>'."\n";
 echo '</body>'."\n";
-echo '</html>'."\n";
\ No newline at end of file
+echo '</html>'."\n";
diff --git a/scripts/nettoyage_sondage.php b/scripts/nettoyage_sondage.php
index 57ab487..5bd387d 100644
--- a/scripts/nettoyage_sondage.php
+++ b/scripts/nettoyage_sondage.php
@@ -49,16 +49,10 @@ $sondage=$connect->Execute("select * from sondage");
 while ($dsondage=$sondage->FetchNextObject(false)) {
   if ($date_courante > strtotime($dsondage->date_fin)) {
     //destruction des données dans la base
-    
-    $req = 'DELETE s, su, u, c
-            FROM
-              sondage s LEFT JOIN sujet_studs su
-                ON su.id_sondage = s.id_sondage
-              LEFT JOIN user_studs u
-                ON u.id_sondage = s.id_sondage
-              LEFT JOIN comments c
-                ON c.id_sondage = s.id_sondage
-            WHERE s.id_sondage = '.$connect->Param('id_sondage');
+    $req = 'DELETE FROM sujet_studs WHERE id_sondage = ' . $connect->Param('id_sondage') . '; ' .
+           'DELETE FROM user_studs  WHERE id_sondage = ' . $connect->Param('id_sondage') . '; ' .
+           'DELETE FROM comments    WHERE id_sondage = ' . $connect->Param('id_sondage') . '; ' .
+           'DELETE FROM sondage     WHERE id_sondage = ' . $connect->Param('id_sondage') ;
     
     $sql = $connect->Prepare($req);
     $connect->Execute($sql, array($dsondage->id_sondage));
@@ -66,4 +60,4 @@ while ($dsondage=$sondage->FetchNextObject(false)) {
     // ecriture des traces dans le fichier de logs
     error_log($date . " SUPPRESSION: $dsondage->id_sondage\t$dsondage->format\t$dsondage->nom_admin\t$dsondage->mail_admin\n", 3, '../admin/logs_studs.txt');
   }
-}
\ No newline at end of file
+}