要了解max功能考虑的employee_tbl表具有以下记录：
mysql> select * from employee_tbl;+------+------+------------+--------------------+| id | name | work_date | daily_typing_pages |+------+------+------------+--------------------+| 1 | john | 2007-01-24 | 250 || 2 | ram | 2007-05-27 | 220 || 3 | jack | 2007-05-06 | 170 || 3 | jack | 2007-04-06 | 100 || 4 | jill | 2007-04-06 | 220 || 5 | zara | 2007-06-06 | 300 || 5 | zara | 2007-02-06 | 350 |+------+------+------------+--------------------+7 rows in set (0.00 sec)
现在，假设根据上述要取表中daily_typing_pages的最大值值，简单地使用下面的命令：
mysql> select max(daily_typing_pages) -> from employee_tbl;+-------------------------+| max(daily_typing_pages) |+-------------------------+| 350 |+-------------------------+1 row in set (0.00 sec)
可以找到所有的记录，最大值为每名使用group by子句如下：
mysql> select id, name, work_date, max(daily_typing_pages) -> from employee_tbl group by name;+------+------+------------+-------------------------+| id | name | work_date | max(daily_typing_pages) |+------+------+------------+-------------------------+| 3 | jack | 2007-05-06 | 170 || 4 | jill | 2007-04-06 | 220 || 1 | john | 2007-01-24 | 250 || 2 | ram | 2007-05-27 | 220 || 5 | zara | 2007-06-06 | 350 |+------+------+------------+-------------------------+5 rows in set (0.00 sec)
也可以使用min函数及max功能找到的最低值，试试下面的例子：
mysql> select min(daily_typing_pages) least, max(daily_typing_pages) max -> from employee_tbl;+-------+------+| least | max |+-------+------+| 100 | 350 |+-------+------+1 row in set (0.01 sec)