mysql 分组后取每个组内最新的一条数据

首先，将按条件查询并排序的结果查询出来。

 mysql> select accepttime,user,job from tuser_job where user =8  order by accepttime desc;
 +---------------------+------+-----+
 | accepttime          | user | job |
 +---------------------+------+-----+
 | 2015-07-27 15:32:45 |    8 |   1 |
 | 2015-07-26 14:22:56 |    8 |   1 |
 | 2015-07-26 10:24:39 |    8 |   2 |
 | 2015-07-20 17:16:38 |    8 |   1 |
 +---------------------+------+-----+
 4 rows in set

然后，从中分组选出最新一条记录。

 mysql> select accepttime,user,job from (select * from tuser_job where user =8  order by accepttime desc) as a group by job;
 +---------------------+------+-----+
 | accepttime          | user | job |
 +---------------------+------+-----+
 | 2015-07-27 15:32:45 |    8 |   1 |
 | 2015-07-26 10:24:39 |    8 |   2 |
 +---------------------+------+-----+
 2 rows in set