SQL组：计算多件事

Question

Right now I've got the following (My)SQL-Statement which returns the amount of entrys based on hour.

SELECT 
    COUNT(*) AS amount
    HOUR(date) AS hour
    -- [1]
FROM
    table
GROUP BY
    HOUR(date)

But I actually want another result that contains the amount of days the hour appeared. Basicly something like:

[1] = COUNT(DAY(date), MONTH(date), YEAR(date)) AS day_count

Example:

id  |   date
0   |   01/01/2001 5:15
1   |   01/01/2001 5:10
2   |   01/01/2001 6:03
3   |   01/01/2001 7:04
4   |   02/01/2001 5:00

Should return

amount  |   hour    |   day_count
3       |   5       |   2
1       |   6       |   1
1       |   7       |   1

Answer 1

I think you just need to part out the days by hour and day, and group by them...

SELECT count(*) as `amount`
     , count(hour(date)) as `Hour`
     , count(day(date)) as `Day_Count`
FROM table 
GROUP BY hour(Date), day(date)