在 MySQL 中使用 COLLATE 查找精确的字符串值?
mysqlmysqli database
让我们首先创建一个 −
mysql> create table DemoTable1620 -> ( -> Subject varchar(20) -> ); Query OK, 0 rows affected (0.42 sec)
使用 insert 在表中插入一些记录 −
mysql> insert into DemoTable1620 values('mysql');
Query OK, 1 row affected (0.13 sec)
mysql> insert into DemoTable1620 values('MySql');
Query OK, 1 row affected (0.11 sec)
mysql> insert into DemoTable1620 values('mYSQL');
Query OK, 1 row affected (0.16 sec)
mysql> insert into DemoTable1620 values('MySQL');
Query OK, 1 row affected (0.26 sec)
mysql> insert into DemoTable1620 values('MYSQL');
Query OK, 1 row affected (0.20 sec)
使用 select 语句显示表中的所有记录 −
mysql> select * from DemoTable1620;
这将产生以下输出 −
+---------+ | Subject | +---------+ | mysql | | MySql | | mYSQL | | MySQL | | MYSQL | +---------+ 5 rows in set (0.00 sec)
以下是在 MySQL 中搜索确切字符串值的查询 −
mysql> select * from DemoTable1620 where Subject collate utf8_bin = 'MySQL';
这将产生以下输出 −
+---------+ | Subject | +---------+ | MySQL | +---------+ 1 row in set (0.00 sec)
