您可以将两个结果集从不同的表合并为一个吗？

Question

我正在尝试将对Authoriser的两个查询的结果合并到一个网格的结果集中。

SQL查询：

SELECT DISTINCT 
    Authoriser, ISNULL(TotalInvoices,0) AS TotalInvoices, 
    ISNULL(TotalRequsitions, 0) AS TotalRequsitions 
FROM 
    (SELECT
         Authoriser AS Authoriser, 
         COUNT(Tiffindex.Page_No) AS TotalInvoices, 
         null AS TotalRequsitions
     FROM  
         Tiffindex
     WHERE 
         Tiffindex.Doc_status = 7 
         AND authoriser != ''
     GROUP BY
         Authoriser
     UNION 
     SELECT
         Authoriser, null, 
         COUNT(RequisitionDetails.UploadTransaction_Id) AS TotalRequsitions 
     FROM
         RequisitionDetails
     WHERE
         RequisitionDetails.Doc_status = 7 AND authoriser != ''
     GROUP BY
         Authoriser) AS secondset

是否可以更改SQL以将结果合并到1个Authoriser行中？

我得到的结果每个授权者可以产生2行。如果可能的话，我希望1？

预先感谢， 格雷厄姆

Answer 1

您可以尝试以下-

SELECT Authoriser, sum(ISNULL(TotalInvoices,0)) AS TotalInvoices, sum(ISNULL(TotalRequsitions,0)) AS TotalRequsitions FROM (
    select Authoriser As Authoriser, Count(Tiffindex.Page_No) as TotalInvoices, null as TotalRequsitions
        from Tiffindex
        where Tiffindex.Doc_status = 7 and authoriser != ''
        group by Authoriser
    UNION 
    select Authoriser, null, Count(RequisitionDetails.UploadTransaction_Id) as TotalRequsitions 
        from RequisitionDetails
        where RequisitionDetails.Doc_status = 7 and authoriser != ''
        group by Authoriser
    ) as secondset group by Authoriser

Answer 2

我建议在外部查询中按授权者进行汇总，然后取其他两列的总和：

SELECT
    Authoriser,
    SUM(TotalInvoices) AS TotalInvoices,
    SUM(TotalRequsitions) AS TotalRequsitions
FROM
(
    SELECT
        Authoriser As Authoriser,
        COUNT(Page_No) AS TotalInvoices,
        NULL AS TotalRequsitions
    FROM Tiffindex
    WHERE Doc_status = 7 AND authoriser != ''
    GROUP BY Authoriser
    UNION ALL
    SELECT
        Authoriser,
        NULL,
        COUNT(UploadTransaction_Id) AS TotalRequsitions 
    FROM RequisitionDetails
    WHERE Doc_status = 7 AND Authoriser != ''
    GROUP BY Authoriser
) AS secondset
GROUP BY
    Authoriser;