极客教程在MySQL的SELECT语句中使用通配符？
如果要添加通配符，可以使用concat()的概念。其语法如下 –
select *from yourTableName where yourColumnName like concat('%',yourValue,'%');
SQL
让我们创建一个表 –
mysql> create table demo48
-> (
−> id int not null auto_increment primary key,
−> name varchar(20)
−> );
Query OK, 0 rows affected (0.70 sec)
SQL
使用insert命令将一些记录插入表中 –
mysql> insert into demo48(name) values('John Smith');
Query OK, 1 row affected (0.12 sec)
mysql> insert into demo48(name) values('John Doe');
Query OK, 1 row affected (0.12 sec)
mysql> insert into demo48(name) values('Adam Smith');
Query OK, 1 row affected (0.23 sec)
mysql> insert into demo48(name) values('David Miller');
Query OK, 1 row affected (0.14 sec)
mysql> insert into demo48(name) values('Chris Brown');
Query OK, 1 row affected (0.11 sec)
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使用SELECT语句从表中显示记录 –
mysql> select *from demo48;
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这将产生以下输出 –
+----+--------------+
| id | name |
+----+--------------+
| 1 | John Smith |
| 2 | John Doe |
| 3 | Adam Smith |
| 4 | David Miller |
| 5 | Chris Brown |
+----+--------------+
5 rows in set (0.00 sec)
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下面是在SELECT语句中添加通配符的查询语句 –
mysql> select *from demo48 where name like concat('%','Smith','%');
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这将产生以下输出 –
+----+------------+
| id | name |
+----+------------+
| 1 | John Smith |
| 3 | Adam Smith |
+----+------------+
2 rows in set (0.00 sec)
SQL
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