MySQL的MIN函數是用來找出一個記錄集最小值的記錄。

要了解MIN函數考慮的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)

現在假設上面的表的基礎上想要取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函數和MAX函數一起，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)

總結

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