if($where_clause)
        {
            //if where clause is set - then it is UPDATE
            if(strpos($where_clause,"STUDENT_ID")!==false)
            {
                $students_RET_1 = DBGet(DBQuery("SELECT STUDENT_ID FROM $table ".$where_clause));
                if(count($students_RET_1))
                {
                    $student_id = array();

                    foreach($students_RET_1 as $student)
                        $student_id[] = $student['STUDENT_ID'];
                }
            }
            unset($sql_data['where_clause']);
        }