if (is_null($id ) && is_null($user_id) && !is_null($evaluation_id)) {
$sql_verified_if_exist_evaluation='SELECT COUNT(*) AS count FROM '.$tbl_grade_results.' WHERE evaluation_id="'.$evaluation_id.'";';
$sql_verified_if_exist_evaluation='SELECT COUNT(*) AS count FROM '.$tbl_grade_results.' WHERE evaluation_id="'.Database::escape_string($evaluation_id).'";';
$sql_verified='SELECT COUNT(*) AS count FROM '.$tbl_grade_results.' WHERE user_id="'.$list_user_course_list[$i]['user_id'].'" AND evaluation_id="'.$evaluation_id.'";';
$sql_verified='SELECT COUNT(*) AS count FROM '.$tbl_grade_results.' WHERE user_id="'.(int)($list_user_course_list[$i]['user_id']).'" AND evaluation_id="'.Database::escape_string($evaluation_id).'";';
$sql_insert='INSERT INTO '.$tbl_grade_results.'(user_id,evaluation_id,date,score) values ("'.$list_user_course_list[$i]['user_id'].'","'.$evaluation_id.'","'.$current_date.'",0);';
$sql_insert='INSERT INTO '.$tbl_grade_results.'(user_id,evaluation_id,date,score) values ("'.Database::escape_string($list_user_course_list[$i]['user_id']).'","'.Database::escape_string($evaluation_id).'","'.$current_date.'",0);';