[英]SQL Sub-query (Where In)
I get an error with my sub-query and am not seeing what I am doing wrong. 我的子查询出现错误,没有看到我在做什么错。 Sub-query works on it's on.
子查询在它上工作。 There Where-In is obviously what is the problem.
哪里有问题显然是什么问题。 Also tried EXISTS.
还尝试了EXISTS。
select [ID NUMBER], [PERNO], [TITLE], [INITIALS], [SURNAME], [DATE OF BIRTH]
from dbo.[DATASEPT002]
WHERE [ID NUMBER] IN
( SELECT [ID NUMBER], COUNT([PERSALNO]) AS COUNTOF
FROM [dbo].[DATASEPT]
GROUP BY [ID NUMBER] HAVING COUNT([PERSALNO]) >1 )
You have two columns in the subquery. 您在子查询中有两列。 Only one can be used for the
IN
comparison: IN
比较只能使用一个:
select [ID NUMBER], [PERNO], [TITLE], [INITIALS], [SURNAME], [DATE OF BIRTH]
from dbo.[DATASEPT002] t
WHERE [ID NUMBER] IN (SELECT [ID NUMBER]
FROM [dbo].[DATASEPT]
GROUP BY [ID NUMBER]
HAVING COUNT([PERSALNO]) > 1
);
However, I would expression this more typically using window functions: 但是,我通常使用窗口函数来表达这一点:
select t.*
from (select t.*, count(*) over (partition by persalno) as cnt
from DATASEPT002 t
) t
where cnt > 1;
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