mysql怎么查询最小值

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本教程操作环境：windows7系统、mysql8版本、Dell G3电脑。

在mysql中，可以使用SELECT语句和MIN() 函数来查询最小值。

首先使用SELECT语句查询指定表中的全部数据
然后利用MIN()函数返回查询结果集中指定列的最小值即可

复制代码SELECT MIN(指定列名) FROM 表名;1
SELECT MIN(指定列名) FROM 表名;
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MIN()函数是用来找出结果集的最小值纪录的，可以返回查询列中的最小值；接受的参数就是指定列名。

查询最小值的示例：

创建一个employee_tbl表，它是具有以下记录：

复制代码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)1
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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)
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现在假设根据上表中,想获取daily_typing_pages的最小值，那么可以简单地使用下面的命令：

复制代码mysql> SELECT MIN(daily_typing_pages)
    -> FROM employee_tbl;
+-------------------------+
| MIN(daily_typing_pages) |
+-------------------------+
|                     100 |
+-------------------------+
1 row in set (0.00 sec)1
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mysql> SELECT MIN(daily_typing_pages)
    -> FROM employee_tbl;
+-------------------------+
| MIN(daily_typing_pages) |
+-------------------------+
|                     100 |
+-------------------------+
1 row in set (0.00 sec)
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使用GROUP BY子句找到所有每个名称最小值的记录如下：

复制代码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 |
+------+------+-------------------------+1
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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 |
+------+------+-------------------------+
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5 rows in set (0.00 sec)可以使用Min()函数和Max()函数一起，找出最小值和最大值。试试下面的例子：

复制代码mysql> SELECT MIN(daily_typing_pages) min, MAX(daily_typing_pages) max
    -> FROM employee_tbl;
+-------+------+
|  min  | max  |
+-------+------+
|   100 |  350 |
+-------+------+
1 row in set (0.01 sec)1
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mysql> SELECT MIN(daily_typing_pages) min, MAX(daily_typing_pages) max
    -> FROM employee_tbl;
+-------+------+
|  min  | max  |
+-------+------+
|   100 |  350 |
+-------+------+
1 row in set (0.01 sec)
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