如何搜尋 MySQL 中的確切字串值?
要搜尋確切的字串值,請使用 COLLATE 概念。我們首先建立一個表 -
mysql> create table DemoTable1620 -> ( -> Subject varchar(20) -> ); Query OK, 0 rows affected (0.42 sec)
使用 insert 命令在表中插入一些記錄 -
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 語句顯示錶中的所有記錄 -
mysql> select * from DemoTable1620;
這將產生以下輸出 -
+---------+ | Subject | +---------+ | mysql | | MySql | | mYSQL | | MySQL | | MYSQL | +---------+ 5 rows in set (0.00 sec)
以下是在 MySQL 中搜索確切字串值的查詢 -
mysql> select * from DemoTable1620 where Subject collate utf8_bin = 'MySQL';
這將產生以下輸出 -
+---------+ | Subject | +---------+ | MySQL | +---------+ 1 row in set (0.00 sec)
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