SQL LIKE

SQL LIKE 操作符

LIKE 操作符用于在 WHERE 子句中搜索列中的指定模式。

SQL LIKE 语法

SELECT column_name(s) FROM table_name WHERE column_name LIKE pattern;

演示数据库

在本教程中,我们将使用 Web3 样本数据库。

下面是选自 "Websites" 表的数据:

+----+--------------+---------------------------+-------+---------+
| id | name         | url                       | alexa | country |
+----+--------------+---------------------------+-------+---------+
| 1  | Google       | https://www.google.cm/    | 1     | USA     |
| 2  | 淘宝          | https://www.taobao.com/   | 13    | CN      |
| 3  | 芝麻教程      | http://www.web3.xin/    | 4689  | CN      |
| 4  | 微博          | http://weibo.com/         | 20    | CN      |
| 5  | Facebook     | https://www.facebook.com/ | 3     | USA     |
| 7  | stackoverflow | http://stackoverflow.com/ |   0 | IND     |
+----+---------------+---------------------------+-------+---------+

SQL LIKE 操作符实例

下面的 SQL 语句选取 name 以字母 "G" 开始的所有客户:

实例

SELECT * FROM Websites
WHERE name LIKE 'G%'; 

执行输出结果:

mysql> select * from websites where name like 'G%';
+----+--------+------------------------+-------+---------+
| id | name   | url                    | alexa | country |
+----+--------+------------------------+-------+---------+
|  1 | Google | https://www.google.cm/ | 1     | USA     |
+----+--------+------------------------+-------+---------+
1 row in set (0.00 sec)

提示:"%" 符号用于在模式的前后定义通配符(缺省字母)。您将在下一章中学习更多有关通配符的知识。

下面的 SQL 语句选取 name 以字母 "k" 结尾的所有客户:

实例

SELECT * FROM Websites
WHERE name LIKE '%k';

执行输出结果:

mysql> select * from websites where name like '%k';
+----+----------+---------------------------+-------+---------+
| id | name     | url                       | alexa | country |
+----+----------+---------------------------+-------+---------+
|  5 | Facebook | https://www.facebook.com/ | 3     | USA     |
+----+----------+---------------------------+-------+---------+
1 row in set (0.00 sec)
下面的 SQL 语句选取 name 包含模式 "oo" 的所有客户:

实例

select * from websites where name like '%oo%';
执行输出结果:
mysql> select * from websites where name like '%oo%';
+----+----------+---------------------------+-------+---------+
| id | name     | url                       | alexa | country |
+----+----------+---------------------------+-------+---------+
|  1 | Google   | https://www.google.cm/    | 1     | USA     |
|  5 | Facebook | https://www.facebook.com/ | 3     | USA     |
+----+----------+---------------------------+-------+---------+
2 rows in set (0.00 sec)
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