如何从 UNION ALL 查询结果的子集中获取结果集

Question

我有这样的查询：

SELECT Temp.description FROM (
    (
        SELECT Clients.aliasname AS description 
        FROM ClientBilling 
        INNER JOIN [B2BSetups].[dbo].Clients ON Clients.cno = ClientBilling.cno 
        WHERE programmerCreditDate >= '11/1/2016' 
            AND programmerCreditDate < '11/29/2016' 
            AND (ClientBilling.programmer='e21' or Clients.admin='e21' or Clients.setup='e21')
    )
    UNION ALL 
    (
        SELECT Clients.aliasname + ' - ' + TradingPartners.aliasname as description 
        FROM RelationshipBilling 
        INNER JOIN [B2BSetups].[dbo].TPRelationships ON TPRelationships.relno = RelationshipBilling.relno 
        INNER JOIN [B2BSetups].[dbo].Clients ON Clients.cno = TPRelationships.cno 
        INNER JOIN [B2BSetups].[dbo].TradingPartners ON TradingPartners.tpno = TPRelationships.tpno 
        WHERE programmerCreditDate >= '11/1/2016' 
            AND programmerCreditDate < '11/29/2016' 
            AND (RelationshipBilling.programmer='e21' or Clients.admin='e21' or Clients.setup='e21')
    )           
    UNION ALL 
    (
        SELECT Clients.aliasname + ' - ' + TradingPartners.aliasname + ' - ' + RelDocs.document as description 
        FROM DocumentBilling 
        INNER JOIN [B2BSetups].[dbo].RelDocs ON RelDocs.recid = DocumentBilling.docno 
        INNER JOIN [B2BSetups].[dbo].TPRelationships ON TPRelationships.relno = RelDocs.relno 
        INNER JOIN [B2BSetups].[dbo].Clients ON Clients.cno = TPRelationships.cno 
        INNER JOIN [B2BSetups].[dbo].TradingPartners ON TradingPartners.tpno = TPRelationships.tpno 
        WHERE programmerCreditDate >= '11/1/2016' AND programmerCreditDate < '11/29/2016' 
            AND (DocumentBilling.programmer='e21' or Clients.admin='e21' or Clients.setup='e21')
    )
) AS Temp 
ORDER BY description;

我正在尝试检索 RelationshipBilling.billedAmount，但是，这仅适用于作为顶级关系的 second/third select 查询。 relno 是必要的 table 的内部联接所必需的。

有没有办法检索这些结果，无论它们是否为空（因为有些会）？

Answer 1

只需在联合中的第一个查询中添加一个虚拟字段，与真实字段的数据类型相同。cast(null as decimal(9,2)) as billedAmount 然后将 billedAmount 添加到其他两个查询中。

Answer 2

您可以按照 second/third 查询的相同顺序将 0 as billedAmount 放在第一个查询中。

Answer 3

你需要这个吗？

   SELECT Clients.aliasname +Temp.description  AS description,billedAmount FROM 
    (


        SELECT RelationshipBilling.programmer,TPRelationships.cno , ' - ' + TradingPartners.aliasname as description ,RelationshipBilling.billedAmount
        FROM RelationshipBilling 
        INNER JOIN [B2BSetups].[dbo].TPRelationships ON TPRelationships.relno = RelationshipBilling.relno 
        INNER JOIN [B2BSetups].[dbo].TradingPartners ON TradingPartners.tpno = TPRelationships.tpno 
        WHERE programmerCreditDate >= '11/1/2016' AND programmerCreditDate < '11/29/2016' 

        UNION ALL 
        SELECT ClientBilling.programmer, ClientBilling.cno,'' AS description,CONVERTNULL AS billedAmount FROM ClientBilling 
        WHERE programmerCreditDate >= '11/1/2016' AND programmerCreditDate < '11/29/2016' 
        UNION ALL 
        SELECT DocumentBilling.programmer,TPRelationships.cno, ' - ' + TradingPartners.aliasname + ' - ' + RelDocs.document as description ,NULL AS billedAmount
        FROM DocumentBilling 
        INNER JOIN [B2BSetups].[dbo].RelDocs ON RelDocs.recid = DocumentBilling.docno 
        INNER JOIN [B2BSetups].[dbo].TPRelationships ON TPRelationships.relno = RelDocs.relno 
        INNER JOIN [B2BSetups].[dbo].TradingPartners ON TradingPartners.tpno = TPRelationships.tpno 
        WHERE programmerCreditDate >= '11/1/2016' AND programmerCreditDate < '11/29/2016' 


    ) AS Temp 
    INNER JOIN [B2BSetups].[dbo].Clients ON Clients.cno = Temp.cno 
    WHERE 'e21' IN (Clients.setup,Clients.admin,temp.programmer)
    ORDER BY description;

如何从 UNION ALL 查询结果的子集中获取结果集

How to get result set from subset of UNION ALL query results

sql

sql-server

union-all