Like关系查询

比如：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。其他库使用字符串连方式连接就可以

select t1.id, t1.title, t2.keyword from t1 inner join t2 on t1.title like '%' || t2.keyword || '%';

其他思路：exists(是否存在)、regexp(正则)、instr(字符串包括)

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,'%'));