MySQL: filling empty fields with zeroes when using GROUP BY

Question

I\'ve got MySQL table

CREATE TABLE cms_webstat (
    ID int NOT NULL auto_increment PRIMARY KEY,
    TIMESTAMP_X timestamp DEFAULT CURRENT_TIMESTAMP,
    # .         


        

Answer 1

I've finaly found the answer. Maybe I'm insane, but this works.

SELECT HOUR, max(HOUR_STAT) as HOUR_STAT FROM (
    (
        SELECT HOUR(TIMESTAMP_X) as HOUR, count(*) as HOUR_STAT
        FROM cms_webstat
        WHERE date(TIMESTAMP_X) = date(now())
    )
    UNION (SELECT 0 as HOUR, 0)
    UNION (SELECT 1 as HOUR, 0)
    UNION (SELECT 2 as HOUR, 0)
    UNION (SELECT 3 as HOUR, 0)
    UNION (SELECT 4 as HOUR, 0)
    UNION (SELECT 5 as HOUR, 0)
    UNION (SELECT 6 as HOUR, 0)
    UNION (SELECT 7 as HOUR, 0)
    UNION (SELECT 8 as HOUR, 0)
    UNION (SELECT 9 as HOUR, 0)
    UNION (SELECT 10 as HOUR, 0)
    UNION (SELECT 11 as HOUR, 0)
    UNION (SELECT 12 as HOUR, 0)
    UNION (SELECT 13 as HOUR, 0)
    UNION (SELECT 14 as HOUR, 0)
    UNION (SELECT 15 as HOUR, 0)
    UNION (SELECT 16 as HOUR, 0)
    UNION (SELECT 17 as HOUR, 0)
    UNION (SELECT 18 as HOUR, 0)
    UNION (SELECT 19 as HOUR, 0)
    UNION (SELECT 20 as HOUR, 0)
    UNION (SELECT 21 as HOUR, 0)
    UNION (SELECT 22 as HOUR, 0)
    UNION (SELECT 23 as HOUR, 0)
)
AS `combined_table`
GROUP BY HOUR
ORDER BY HOUR DESC

One MySQL query as desired.