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mysql中和min一样用法_MySQL中MIN()函数的使用教程
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MySQL的MIN函数是用来找出一个记录集最小值的记录。
要了解MIN函数考虑的EMPLOYEE_TBL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： mysql> SELECT MIN(daily_typing_pages)
-> FROM employee_tbl;
+-------------------------+
| MIN(daily_typing_pages) |
+-------------------------+
| 100 |
+-------------------------+
1 row in set (0.00 sec)
可以找到所有记录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函数和MAX函数一起，查找最小值。试试下面的例子： 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)
