MySQL通配符过滤数据

LIKE操作符

百分号（%）通配符

mysql> select * from user where name like '%3';
+----+-------+
| id | name  |
+----+-------+
|  3 | user3 |
+----+-------+
1 row in set (0.00 sec)

mysql> select * from user where name like 'user%';
+----+-------+
| id | name  |
+----+-------+
|  1 | user1 |
|  2 | user2 |
|  3 | user3 |
|  4 | user4 |
|  5 | user5 |
+----+-------+
5 rows in set (0.00 sec)

mysql> select * from user where name like '%er%';
+----+-------+
| id | name  |
+----+-------+
|  1 | user1 |
|  2 | user2 |
|  3 | user3 |
|  4 | user4 |
|  5 | user5 |
+----+-------+
5 rows in set (0.00 sec)
//不能用'%'来代替NULL。

下划线（_）通配符

mysql> select * from user where name like 'user_';
+----+-------+
| id | name  |
+----+-------+
|  1 | user1 |
|  2 | user2 |
|  3 | user3 |
|  4 | user4 |
|  5 | user5 |
+----+-------+
5 rows in set (0.00 sec)

mysql> select * from user where name like '_ser_';
+----+-------+
| id | name  |
+----+-------+
|  1 | user1 |
|  2 | user2 |
|  3 | user3 |
|  4 | user4 |
|  5 | user5 |
+----+-------+
5 rows in set (0.00 sec)

mysql> select * from content where tittle like '_ello%';
+------+--------------+
| uid  | tittle       |
+------+--------------+
|    0 | Hello World! |
+------+--------------+
79 rows in set (0.00 sec)

通配符使用技巧