MySQL的MIN函數(shù)是用來找出一個記錄集最小值的記錄。
要了解MIN函數(shù)考慮的EMPLOYEE_TBL表具有以下記錄：
| 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) |
現(xiàn)在假設(shè)上面的表的基礎(chǔ)上想要取daily_typing_pages的最小值，那么可以這樣做，簡單地使用下面的命令：
| mysql> SELECT MIN(daily_typing_pages) -> FROM employee_tbl;+-------------------------+| MIN(daily_typing_pages) |+-------------------------+| 100 |+-------------------------+1 row in set (0.00 sec) |
可以找到所有記錄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函數(shù)和MAX函數(shù)一起，查找最小值。試試下面的例子：
| 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) |
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