Question

在下面的代码中我收到此错误：

无法绑定多部分标识符tblExtraFeature.ProjectId

我认为这是一个范围问题，因为from tblExtraFeature在parens中。如果我从第一行删除tblExtraFeature.ProjectId，它就有效。是的ProjectId在tblExtraFeature中。我尝试为tblExtraFeature分配别名，但同样的问题。我怎样才能让它发挥作用？

select tblExtraFeature.ProjectId, tblFeature.FeatureId
  from tblFeature 
  with (NOLOCK)
  where  NOT EXISTS (select *
  from   tblExtraFeature 
    where tblFeature.FeatureId = tblExtraFeature.FeatureId)

编辑：
我应该在一开始就说明这一点......我想要得到的是tblExtraFeature中不在tblFeature中的所有行。

Answer 1

只需将tblExtraFeature和tblFeature表互相替换即可。并从select部分中删除tblFeature.FeatureId。

select *
from tblExtraFeature with (NOLOCK)
where NOT EXISTS (select *
from tblFeature  
where 
     tblFeature.FeatureId = tblExtraFeature.FeatureId )

Answer 2

如果tblExtraFeature.FeatureId是引用tblFeature的外键，那么tblExtraFeature中不在tblFeature中的行应该是tblExtraFeature中featureId为null的行。

select * from tblExtraFeature where featureId is null

给出你想要的结果？

Answer 3

尝试：

Select * from tblExtraFeature ef
left outer join tblFeature f on f.featureid = ef.featureid
where f.featureid IS NULL

Answer 4

我想要得到的是tblExtraFeature中的所有行不在tblFeature。

SELECT ProjectId, 
       FeatureId
  FROM tblExtraFeature 
  WITH (NOLOCK)
 WHERE FeatureId NOT IN (SELECT FeatureId
                           FROM tblFeature 
                        )

无法绑定多部分标识符 - 不是EXISTS

4 个答案: