组合两个SQL列合并到一列

Question

我有表有两列，他们都包含整数值，看起来像这样：

DocumentUpId RelatedDocId 
31608768  31624333 
31608768  31624334 
31618133  31618117 

，我试图将它们合并到像这样的单个列：

DocumentUpId  
31608768   
31608768   
31618133  
31624333 
31624334 
31624334 

我已经试过这样：

select rel_CTE.DocumentUpId + rel_CTE.DocumentDownId as 'RelatedDocId' 
into #temprelations 
from RelationsCTE rel_CTE 

但它给我串连值（以及总和在这种情况下），所以我可能吗？

Answer 1

UNION ALL

select rel_CTE.DocumentUpId as 'RelatedDocId' from RelationsCTE 
union all 
select rel_CTE.DocumentDownId from RelationsCTE 

Answer 2

尝试这样，

SELECT DocumentUpId as DocumentUpId 
FROM RelationsCTE 

UNION ALL 

SELECT DocumentDownId as DocumentUpId 
FROM RelationsCTE 

Answer 3

尝试使用CROSS -APPLY :)一些不同的东西。

SELECT [RelatedDocId] 
FROM RelationsCTE 
    CROSS APPLY (VALUES(DocumentUpId), 
        (DocumentDownId)) V([RelatedDocId])