Mysql错误消息：1242子查询返回超过1行

Question

我在数据库中有两个表，我有问题

当我在mysql中推荐它时，它可以工作

    select 
    (select deptno.`FName` 
        from deptno where deptno.`FID` = person.`Unit1No`) as  dept
            from person,leavemonth WHERE person.PsnNo = leavemonth.PsnNo

但是当我选择这个条件时， 它给我一个像问题标题

的消息

        select 
        (SELECT leavemonth.`H08` FROM leavemonth where leavemonth.`PsnNo` = person.`PsnNo` )
            as H08
    from person,leavemonth WHERE person.PsnNo = leavemonth.PsnNo

我尝试了许多方法并尝试回答，但总是失败，

有人可以教我并告诉我如何解决它吗？

Answer 1

它适合你

select l.H08 as H08
from person p
inner join leavemonth l on p.PsnNo = l.PsnNo