查询将MySQL LIKE实现为MySQL IN？

要实现类似MySQLIN()的查询，您需要使用COUNT()，IF()以及LIKE运算符。让我们首先创建一个表-

create table DemoTable -> ( -> Subject varchar(80) -> );

使用插入命令在表中插入一些记录-

insert into DemoTable values(MySQLMongoDB); insert into DemoTable values(MySQL); insert into DemoTable values(JavaMySQL); insert into DemoTable values(MongoDB); insert into DemoTable values(Java);

使用select语句显示表中的所有记录-

select *from DemoTable;

这将产生以下输出-

+--------------+ | Subject | +--------------+ | MySQLMongoDB | | MySQL | | JavaMySQL | | MongoDB | | Java | +--------------+ 5 rows in set (0.00 sec)

这是将LIKE实现为IN()的查询-

select -> count(if(Subject like %MySQL%,1,NULL)) as MySQLCount, -> count(if(Subject like %Java%,1,NULL)) as JavaCount, -> count(if(Subject like %MongoDB%,1,NULL)) as MongoDBCount -> from DemoTable;

这将产生以下输出-

+------------+-----------+--------------+ | MySQLCount | JavaCount | MongoDBCount | +------------+-----------+--------------+ | 3 | 2 | 2 | +------------+-----------+--------------+ 1 row in set (0.00 sec)