要了解MIN函数考虑的EMPLOYEE_TBL表具有以下记录:
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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:
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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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可以找到所有记录的最小值按名字使用GROUP BY子句如下:
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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)
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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:
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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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