Correct SQL Delete Trainee query

DataBaseLMS/databaselms_trainees.cpp

@@ -261,6 +261,39 @@ int DataBaseLMS::deleteTrainee(int id_trainee)
 
 
     //Удаление задач AMM
+    /*Выборка задач AMM для этого обучаемого*/
+    queryStr = QString("SELECT tasks_amm.task_id "
+                                                 "FROM public.tasks_amm "
+                                                 "WHERE tasks_amm.fk_trainee_id = %1 "
+                                                 "ORDER BY tasks_amm.task_id ASC").arg(
+                                                        id_trainee);
+
+    QSqlQuery queryTasksAMMSEL = QSqlQuery(*db);
+    if(queryExec(queryStr, &queryTasksAMMSEL))
+    {
+        while (queryTasksAMMSEL.next())
+        {//Задача
+            int task_id = queryTasksAMMSEL.value(0).toInt();
+
+            queryStr = QString("DELETE FROM public.subprocs "
+                                                         "WHERE fk_task_amm_id = %1 ").arg(
+                                                                QString::number(task_id));
+
+            QSqlQuery querySubProcDEL = QSqlQuery(*db);
+            if(!queryExec(queryStr, &querySubProcDEL))
+            {
+                resBool = db->rollback();
+                return 0;
+            }
+        }
+    }
+    else
+    {
+        resBool = db->rollback();
+        return 0;
+    }
+
+
     queryStr = QString("DELETE FROM public.tasks_amm "
                                                      "WHERE fk_trainee_id = %1 ").arg(
                                                             QString::number(id_trainee));