下面语句用left join 还是用not in?

Question

实现：查询a中没有关联b的记录

1、select id from a left join b on a.id = b.aid where b.id is null and status = 1

2、select id from a where id not in (select aid from b) and  status = 1

那种更好，或者有其他的方式，请大神留下答案

Answer 1

not exists正解

select id from a where not exists (select 1 from b where a.id=b.aid) and status = 1

Answer 2

我想使用 not exists

浅谈sql中的in与not in,exists与not exists的区别