I have a table: orders, and need to make a request and get other table.
My DB table:
id close
1 2012-05-29 03:11:15
2 2012-05-30 03:11:40
3 2012-05-31 03:12:10
4 2012-05-31 03:14:13
5 2012-05-31 03:16:50
6 2012-05-31 03:40:07
7 2012-05-31 05:22:18
8 2012-05-31 05:22:22
9 2012-05-31 05:22:50
...
I need to make a request and get this table (GROUP BY DAY(close)):
1 2012-05-29 03:11:15
2 2012-05-30 03:11:40
9 2012-05-31 05:22:50 /*This is a last record on this day (05-31)*/
Thanks!
If I make this request:
SELECT id, close
FROM `orders`
GROUP BY DAY(close)
ORDER BY id ASC
I will get this table:
1 2012-05-29 03:11:15
2 2012-05-30 03:11:40
3 2012-05-31 03:12:10
解决方案
Try this, this will do.
SELECT
a.id,
a.close
FROM
(
SELECT
id,
close
FROM
`orders`
ORDER BY
close DESC
) AS a
GROUP BY
DATE(a.close)
ORDER BY
a.id
ASC;