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sql: left join vs. not in

yunbo1
数据库
2026-09-16
191

select * from product.login_info where username not in (select username from stat.totaluser)

vs.

select a.* from product.login_info as a left join stat.totaluser as b on a.username = b.username where b.username is null

上面2条sql语句的执行结果集是一样的

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