MySQL中MIN()函数的使用教程
时间：2021-04-02 09:46:12|栏目：Mysql|点击： 次
MySQL的MIN函数是用来找出一个记录集最小值的记录。
要了解MIN函数考虑的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)
现在假设上面的表的基础上想要取daily_typing_pages的最小值，那么可以这样做，简单地使用下面的命令：
mysql> SELECT MIN(daily_typing_pages) -> FROM employee_tbl; +-------------------------+ | MIN(daily_typing_pages) | +-------------------------+ | 100 | +-------------------------+ 1 row in set (0.00 sec)
可以找到所有记录的最小值按名字使用GROUP BY子句如下：
mysql> id, name, work_date, MIN(daily_typing_pages) -> FROM employee_tbl GROUP BY name; +------+------+------------+-------------------------+ | id | name | work_date | MIN(daily_typing_pages) | +------+------+------------+-------------------------+ | 3 | Jack | 2007-05-06 | 100 | | 4 | Jill | 2007-04-06 | 220 | | 1 | John | 2007-01-24 | 250 | | 2 | Ram | 2007-05-27 | 220 | | 5 | Zara | 2007-06-06 | 300 | +------+------+------------+-------------------------+ 5 rows in set (0.00 sec)
您可以使用MIN函数和MAX函数一起，查找最小值。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)
