无涯教程-MySQL MIN Function函数

MySQL MIN 函数用于在记录集中找出最小值的记录。

要了解 MIN 函数,请考虑一个 employee_tbl 表,该表具有以下记录-

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,假设基于上表您要获取daily_typing_pages的最小值,那么您可以使用以下命令简单地做到这一点-

mysql> SELECT MIN(daily_typing_pages)
   -> FROM employee_tbl;
+-------------------------+
| MIN(daily_typing_pages) |
+-------------------------+
|          100            |
+-------------------------+
1 row in set (0.00 sec)

您可以使用 GROUP BY 子句找到每个名称具有最小值的所有记录,如下所示-

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)

您还可以将 MIN 函数与 MAX 函数一起使用,以找出最小值。尝试以下Example-

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)

参考链接

https://www.learnfk.com/mysql/mysql-min-function.html