Like关联查询
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2022-06-11 12:00:16
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例如:有表1,表2两张相,希望通过like进行关联查询// mysql中使用concat连接字符串select t1.id, t1.title, t2.keyword from t1 inner join t2 on t1.title like concat('%', t2.keyword, '%'); // oracle、postgres 使用||连接字符串,其它库使用字符串连方
例如:有表1,表2两张相,希望通过like进行关联查询 // mysql中使用concat连接字符串 select t1.id, t1.title, t2.keyword from t1 inner join t2 on t1.title like concat('%', t2.keyword, '%');// oracle、postgres 使用||连接字符串,其它库使用字符串连方式连接即可 select t1.id, t1.title, t2.keyword from t1 inner join t2 on t1.title like '%' || t2.keyword || '%';
其它思路:exists(是否存在)、regexp(正则)、instr(字符串包含) select distinct t1.title from t1 , t2 where instr(t1.title,t2.keyword); select distinct t1.title from t1 inner join t2 on t1.title regexp t2.keyword; select * from t1 where exists (select keyword from t2 where t1.title regexp keyword); select * from t1 where exists (select keyword from t2 where t1.title like concat('%',keyword,'%'));