$sql = "UPDATE $TBL_LP_ITEM_VIEW SET status = 'completed' WHERE lp_item_id = '".Database::escape_string($learnpath_item_id)."'
AND lp_view_id = (SELECT lp_view.id FROM $TBL_LP_VIEW lp_view WHERE user_id = '".Database::escape_string($user_id)."' AND lp_id='".Database::escape_string($learnpath_id)."')";