获取MySQL中每个月的最后一条记录....

Question

我在编写MySQL查询时遇到问题.我在DB中有以下字段

id     created_on            status
1      2011-02-15 12:47:09    1 
2      2011-02-24 12:47:09    1
3      2011-02-29 12:47:09    1
4      2011-03-11 12:47:09    1
5      2011-03-15 12:47:09    1
6      2011-03-22 12:47:09    1
7      2011-04-10 12:47:09    1
8      2011-04-11 12:47:09    1

我需要select the last record of each month.这是为了month FEB record # 3 month MARCH record # 6 和为month APRIL record # 8

请帮我.....

提前致谢.....

Answer 1

SELECT * FROM table 
WHERE created_on in 
(select DISTINCT max(created_on) from table 
GROUP BY YEAR(created_on), MONTH(created_on))

Answer 2

建立Dheer的答案：

SELECT r.*
FROM table AS r
    JOIN (
        SELECT MAX(t.created_on) AS created_on
        FROM table AS t
        GROUP BY YEAR(t.created_on), MONTH(t.created_on)
    ) AS x USING (created_on)

请确保您在created_on上具有索引，否则，如果该表获得了几百行以上，则此查询将杀死您的数据库。