MySQL 中MIN ()函数的使⽤教程
MySQL中MIN()函数的使⽤教程MySQL 的MIN 函数是⽤来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: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:
1
2
3
4
5
mysql入门基础教程6
7
8
9
10
11
12
13 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 |+matlab程序设计与应用第三版答案
------+------+------------+--------------------+
7
rows
in
set
(0.00 sec)
可以到所有记录的最⼩值按名字使⽤GROUP BY ⼦句如下:
1
2
3
4
5
6
7
8 mysql> SELECT MIN (daily_typing_pages) -> FROM employee_tbl;+-------------------------+| MIN (daily_typing_pages) |+
-------------------------+
| 100 |
+
-------------------------+
1 row
in
set
(0.00 sec)
1
2
3玳瑁指甲500元的图片
4
5
6
7
8
9
10
11
12 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 |
puts头文件
| 4 | Jill | 2007-04-06 | 220 |
| 1 | John | 2007-01-24 | 250 |
您可以使⽤MIN 函数和MAX 函数⼀起,查最⼩值。试试下⾯的例⼦:| 2 | Ram | 2007-05-27 | 220 |
| 5 | Zara | 2007-06-06 | 300 |
+
------+------+------------+-------------------------+
5
rows
in
set
(0.00 sec)
1
2
3
4
5
6
7
documentary的中文有没有php培训班8 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)
版权声明:本站内容均来自互联网,仅供演示用,请勿用于商业和其他非法用途。如果侵犯了您的权益请与我们联系QQ:729038198,我们将在24小时内删除。
发表评论