如果sql语句中的子查询包含limit
例如： select * from a where id in (select id from b limit 3)
会报错：This version of MySQL doesn’t yet support ‘LIMIT & IN/ALL/ANY/SOME subquery‘ #
解决办法：
1、加一层子查询
例如：select * from a where id in (select t.id from (select id from b limit 3 )as t)
2、把限制条件放到from而非where子句中，就不必出现嵌套再嵌套。
例如：select * from (select id from a limit 3) as foo