如何获得结果从UNION的子集所有查询结果

问题描述：

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;

我试图找回RelationshipBilling.billedAmount，然而，这仅适用于第二/第三选择查询作为顶级关系。内部连接必需的表格需要relno。

有没有办法检索这些结果，无论它们是否为null（因为有些将是）？

添加具有样本数据和预期输出的表结构。 –

答

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。

答

您可以将0 as billedAmount置于第二个/第三个查询的相同顺序的第一个查询中。

答

这是您需要的吗？

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;

如何获得结果从UNION的子集所有查询结果

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