删除具有左连接的另一个选择的查询

Question

我必须删除此选择的结果。 我试图创建一个新表并在其中插入select的结果，然后删除。 谁能帮帮我？

select * 
from SurveySession ss (nolock)
left join
SurveySessionPages sp 
on ss.Id = sp.SurveySessionID
left join 
SurveySessionAnswers sa
on ss.Id = sa.SurveySessionID
left join 
SurveySessionAnswerChoices sac
on sa.Id = sac.SurveySessionAnswerId
left join 
SurveySessionXmlData sxd
on ss.Token = sxd.Token
where ss.StartedOn <= dateadd(day,datediff(day,0,getdate())-365,0) 
and (ss.UpdatedOn is null or ss.UpdatedOn <= dateadd(day,datediff(day,0,getdate())-365,0)))

Answer 1

您可以将查询用作子查询并删除其结果。

DELETE FROM SurveySession WHERE Id=(select * 
from SurveySession ss (nolock)
left join
SurveySessionPages sp 
on ss.Id = sp.SurveySessionID
left join 
SurveySessionAnswers sa
on ss.Id = sa.SurveySessionID
left join 
SurveySessionAnswerChoices sac
on sa.Id = sac.SurveySessionAnswerId
left join 
SurveySessionXmlData sxd
on ss.Token = sxd.Token
where ss.StartedOn <= dateadd(day,datediff(day,0,getdate())-365,0) 
and (ss.UpdatedOn is null or ss.UpdatedOn <= dateadd(day,datediff(day,0,getdate())-365,0))))    

Answer 2

您可以添加delete而不是select，并按照这样做。

delete SurveySession 
from SurveySession ss 
left join
SurveySessionPages sp 
on ss.Id = sp.SurveySessionID
left join 
SurveySessionAnswers sa
on ss.Id = sa.SurveySessionID
left join 
SurveySessionAnswerChoices sac
on sa.Id = sac.SurveySessionAnswerId
left join 
SurveySessionXmlData sxd
on ss.Token = sxd.Token
where ss.StartedOn <= dateadd(day,datediff(day,0,getdate())-365,0) 
and (ss.UpdatedOn is null or ss.UpdatedOn <= dateadd(day,datediff(day,0,getdate())-365,0)))

Answer 3

你需要回答NoDisplayName的问题才能获得明确的答案，但是：

1. 如果您只想从SurveySession中删除，只需将其更改为删除并删除所有左连接，因为它们没有对SurveySession进行任何过滤。
2. 如果你想删除其中一个表，我会将查询重组为surveysession和该表之间的内部联接。
3. 如果要删除所有符合where条件的surveysession记录以及所有与surveysession匹配的左连接表，则应为每个记录创建一个删除语句（有两种不同的方法）。