string(1) "/"
int(0)
An exception occurred while executing 'SELECT 
            s.id, day_of_week AS dow, 
            GROUP_CONCAT(user_no) AS users, 
            COUNT(user_no) AS people, 
            STR_TO_DATE(CONCAT(YEAR(NOW()),' ', WEEK(NOW()),' ', day_of_week), '%X %V %w') AS date, 
            CONCAT_WS(':', LPAD(start_hour,2,0),'00') AS start, 
            CONCAT_WS(':', LPAD(end_hour,2,0),'00') AS end
            FROM `schedule` s
            JOIN user u
            ON u.`no` = s.user_no
            where active = 1 AND case u.employee when 1 then s.week_number > WEEK(NOW(),3) ELSE 1= 1 END
            GROUP BY day_of_week, start_hour
            ORDER BY day_of_week, night_shift, start_hour ASC;            ':

SQLSTATE[HY000]: General error: 1 Can't create/write to file '/var/tmp/#sql_2d0834_2.MAI' (Errcode: 28 "No space left on device")