MySQL学习足迹记录05--数据过滤--AND,OR,NOT,IN_MySQL

来源：动视网责编：小采时间：2020-11-09 18:41:10

MySQL学习足迹记录05--数据过滤--AND,OR,NOT,IN_MySQL

MySQL学习足迹记录05--数据过滤--AND,OR,NOT,IN_MySQL:bitsCN.com MySQL学习足迹记录05--数据过滤--AND,OR,NOT,IN 1.AND操作符 * 检索匹配满足所有给定条件的行 eg: mysql> SELECT prod_id,prod_price,prod_name FROM products WHERE -> vend_id =1003 AND prod_p

推荐度：

点击下载本文 文档为doc格式

导读MySQL学习足迹记录05--数据过滤--AND,OR,NOT,IN_MySQL:bitsCN.com MySQL学习足迹记录05--数据过滤--AND,OR,NOT,IN 1.AND操作符 * 检索匹配满足所有给定条件的行 eg: mysql> SELECT prod_id,prod_price,prod_name FROM products WHERE -> vend_id =1003 AND prod_p

bitsCN.com

MySQL学习足迹记录05--数据过滤--AND,OR,NOT,IN

1.AND操作符

* 检索匹配满足所有给定条件的行

eg: mysql> SELECT prod_id,prod_price,prod_name FROM products WHERE -> vend_id =1003 AND prod_price<=10;+---------+------------+----------------+| prod_id | prod_price | prod_name |+---------+------------+----------------+| FB | 10.00 | Bird seed || FC | 2.50 | Carrots || SLING | 4.49 | Sling || TNT1 | 2.50 | TNT (1 stick) || TNT2 | 10.00 | TNT (5 sticks) |+---------+------------+----------------+5 rows in set (0.00 sec)

2.OR操作符

*检索匹配满足给定任一条件的行

 eg: mysql> SELECT prod_name,prod_price FROM products -> WHERE vend_id=1002 or vend_id=1003;+----------------+------------+| prod_name | prod_price |+----------------+------------+| Detonator | 13.00 || Bird seed | 10.00 || Carrots | 2.50 || Fuses | 3.42 || Oil can | 8.99 || Safe | 50.00 || Sling | 4.49 || TNT (1 stick) | 2.50 || TNT (5 sticks) | 10.00 |+----------------+------------+9 rows in set (0.01 sec)

3.计算次序

*WHERE可以包含任意数目的AND和OR操作符。

 eg: mysql> SELECT prod_name,prod_price FROM products -> WHERE vend_id=1002 OR vend_id=1003 AND prod_price>=10; #在处理OR操作符之前，AND操作符会被优先处理+----------------+------------+| prod_name | prod_price |+----------------+------------+| Detonator | 13.00 || Bird seed | 10.00 || Fuses | 3.42 || Oil can | 8.99 || Safe | 50.00 || TNT (5 sticks) | 10.00 |+----------------+------------+6 rows in set (0.00 sec)

4.用（）改变计算次序

eg: mysql> SELECT prod_name,prod_price FROM products -> WHERE (vend_id=1002 OR vend_id=1003) AND prod_price >= 10; #先计算OR，再计算AND+----------------+------------+| prod_name | prod_price |+----------------+------------+| Detonator | 13.00 || Bird seed | 10.00 || Safe | 50.00 || TNT (5 sticks) | 10.00 |+----------------+------------+4 rows in set (0.00 sec)

5.IN操作符

*用来指定条件范围

eg: mysql> SELECT prod_name,prod_price FROM products -> WHERE vend_id IN (1002,1003) -> ORDER BY prod_name;+----------------+------------+| prod_name | prod_price |+----------------+------------+| Bird seed | 10.00 || Carrots | 2.50 || Detonator | 13.00 || Fuses | 3.42 || Oil can | 8.99 || Safe | 50.00 || Sling | 4.49 || TNT (1 stick) | 2.50 || TNT (5 sticks) | 10.00 |+----------------+------------+9 rows in set (0.00 sec)

上面的语句等效于：

mysql> SELECT prod_name,prod_price FROM products -> WHERE vend_id =1002 OR vend_id = 1003 -> ORDER BY prod_name;+----------------+------------+| prod_name | prod_price |+----------------+------------+| Bird seed | 10.00 || Carrots | 2.50 || Detonator | 13.00 || Fuses | 3.42 || Oil can | 8.99 || Safe | 50.00 || Sling | 4.49 || TNT (1 stick) | 2.50 || TNT (5 sticks) | 10.00 |+----------------+------------+9 rows in set (0.00 sec)

6.NOT操作符

*否定它之后所跟的任何条件

eg: mysql> SELECT vend_id,prod_price FROM products -> WHERE vend_id NOT IN (1002,1003) -> ORDER BY prod_name;+---------+------------+| vend_id | prod_price |+---------+------------+| 1001 | 5.99 || 1001 | 9.99 || 1001 | 14.99 || 1005 | 35.00 || 1005 | 55.00 |+---------+------------+5 rows in set (0.00 sec)

bitsCN.com

MySQL学习足迹记录05--数据过滤--AND,OR,NOT,IN_MySQL

推荐度：

点击下载本文 文档为doc格式

标签：过滤记录数据

热门焦点

MySQL学习足迹记录05--数据过滤--AND,OR,NOT,IN_MySQL

MySQL学习足迹记录05--数据过滤--AND,OR,NOT,IN_MySQL

MySQL学习足迹记录05--数据过滤--AND,OR,NOT,IN_MySQL

最新推荐

猜你喜欢

热门推荐