php - 从不同表获取时子查询出错

Question

我运行下面的查询并出现错误

sub-query returns multiple rows

我已将所有子查询 in 替换为 any 和 =。但问题还没有解决。

SELECT *
from UserPost
where UserId = UserId_Param
   or UserId = any (select UserId from UserPals
                    where PalUserId = UserId_Param and FriendStatus = 1)
   or UserId = any (select PalUserId from UserPals
                    where UserId = UserId_Param and FriendStatus = 1)
and privacy = 1
and PostId not in (select PostId from UserHidePost where UserId = UserId_Param)
and Committed = 1
and Trashed = 0 

union all

select *
from UserPost
where privacy = 2
  and PostId = any(select PostId from PostCategory
                   where PalCategoryId = any (select UserPalCategoryId
                                              from PalCategory
                                              where userId = UserId_Param
                                                 or PalUserId = UserId_Param))
  and PostId not in(select PostId from UserHidePost
                    where UserId = UserId_Param)
  and Committed = 1
  and (UserId = any (select UserId from UserPals
                     where PalUserId = UserId_Param and FriendStatus = 1)
       or (select PalUserId from UserPals
           where UserId = UserId_Param and FriendStatus = 1))
  and Trashed = 0
LIMIT lim_val OFFSET lim_offset;

Answer 1

唯一明显的(对我来说)可能导致这种情况的子查询是:

 (select PalUserId from UserPals
       where UserId = UserId_Param and FriendStatus = 1)

也许你想要存在:

exists (select PalUserId from UserPals
        where UserId = UserId_Param and FriendStatus = 1
       )

顺便说一句，混合使用 = any () 和 in 似乎有点奇怪。