如何通过MAX(日期)检索行数据？

Question

这里有张桌子:

+---------+--------+---------------------+----------+
| user_id | marker | date                | trans_id |
+---------+--------+---------------------+----------+
|       6 | M      | 2013-08-27 11:45:24 |        5 |
|       6 | MA     | 2013-08-27 11:45:42 |        6 |
|       6 | A      | 2013-08-27 11:45:59 |        7 |
+---------+--------+---------------------+----------+

我测试了查询:
SELECT marker , MAX(date) AS maxdate FROM mytable WHERE user_id =6
但它不合适.你会怎么写查询？提前致谢.

Answer 1

这将为您提供最新的记录 user_id

SELECT  a.*
FROM    tableName a
        INNER JOIN
        (
            SELECT  user_id , MAX(date) date
            FROM    tableName
            GROUP   BY user_ID
        ) b ON a.user_id = b.user_id AND
                a.date = b.date
-- WHERE    a.user_id = 6         ==> if you want for specific user_id only

• SQLFiddle演示