MIN 函数用于寻找记录集中拥有最小值的记录。
为了理解 MIN 函数，还是以 employee_tbl 表为例，它的所有记录如下所示：
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)
假设需要根据上表获取 daily_typing_pages 的最小值，只需使用如下命令即可：
mysql> SELECT MIN(daily_typing_pages) -> FROM employee_tbl; +-------------------------+ | MIN(daily_typing_pages) | +-------------------------+ | 100 | +-------------------------+ 1 row in set (0.00 sec)
也可以使用 GROUP BY 子句找到每一名字下的最小值记录。
mysql>SELECT id, name, MIN(daily_typing_pages) -> FROM employee_tbl GROUP BY name; +------+------+-------------------------+ | id | name | MIN(daily_typing_pages) | +------+------+-------------------------+ | 3 | Jack | 100 | | 4 | Jill | 220 | | 1 | John | 250 | | 2 | Ram | 220 | | 5 | Zara | 300 | +------+------+-------------------------+ 5 rows in set (0.00 sec)
还可以组合使用 MIN 与 MAX 函数找出最小值，如下所示：
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)
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