相信很多同学都使用过MySQL的GROUP BY分组查询，例如我有一个表： [shell] +----+----------+------+ | id | name | mark | +----+----------+------+ | 1 | david | 22 | | 2 | tom | 33 | | 3 | tom | 34 | | 4 | gavin | 45 | | 5 | hellogxp | 33 | | 6 | hellogxp |...