組合兩個SQL列合併到一列

Question

我有表有兩列，他們都包含整數值，看起來像這樣：

DocumentUpId RelatedDocId 
31608768  31624333 
31608768  31624334 
31618133  31618117 

，我試圖將它們合併到像這樣的單個列：

DocumentUpId  
31608768   
31608768   
31618133  
31624333 
31624334 
31624334 

我已經試過這樣：

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

但它給我串連值（以及總和在這種情況下），所以我可能嗎？

Answer 1

UNION ALL

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

Answer 2

嘗試這樣，

SELECT DocumentUpId as DocumentUpId 
FROM RelationsCTE 

UNION ALL 

SELECT DocumentDownId as DocumentUpId 
FROM RelationsCTE 

Answer 3

嘗試使用CROSS -APPLY :)一些不同的東西。

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