sql - 使用 Join 和 Group By 更新语句

Question

我写了下面的更新语句，但它显示了诸如“关键字'GROUP'附近的语法不正确”之类的错误。

UPDATE 
       J
SET 
       J.StatusID = CASE WHEN SUM(DUV.VendorDUQuantity) = SUM(RD.InvoiceQuantity) THEN 1 ELSE J.StatusID END
FROM
        PLN_DU_Vendor DUV
    INNER JOIN ENG_Release R ON R.ReleaseID = DUV.ReleaseID
    INNER JOIN ENG_DU_Header H ON H.ReleaseID = R.ReleaseID AND DUV.DUID = H.DUID
    INNER JOIN MKT_JobOrder J ON J.JobOrderID = R.JobOrderID
    INNER JOIN MKT_CustomerOrder CO ON CO.OrderID = J.OrderID
    LEFT JOIN PMT_RFDHeader RH ON RH.JobOrderID = J.JobOrderID
    LEFT JOIN PMT_RFDDetail RD ON RD.RFDID = RH.RFDID AND RD.DUID = DUV.DUID                 
WHERE 
        CO.OrderID = 100
GROUP BY 
        J.JobOrderID

Select 不是 Update，而是适用于上述 Query。会出现什么问题以及如何根据 Join 和 Group By 子句编写查询。

Answer 1

您可以尝试将组放入子查询中，然后按“JobOrderID”加入，如下所示:

UPDATE J
SET J.StatusID = A.statusId
FROM MKT_JobOrder J
INNER JOIN (
    SELECT J.JobOrderID
        , CASE 
            WHEN SUM(DUV.VendorDUQuantity) = SUM(RD.InvoiceQuantity)
                THEN 1
            ELSE J.StatusID
            END AS statusId 
    FROM PLN_DU_Vendor DUV
    INNER JOIN ENG_Release R ON R.ReleaseID = DUV.ReleaseID
    INNER JOIN ENG_DU_Header H ON H.ReleaseID = R.ReleaseID
                               AND DUV.DUID = H.DUID
    INNER JOIN MKT_JobOrder J ON J.JobOrderID = R.JobOrderID
    INNER JOIN MKT_CustomerOrder CO ON CO.OrderID = J.OrderID
    LEFT JOIN PMT_RFDHeader RH ON RH.JobOrderID = J.JobOrderID
    LEFT JOIN PMT_RFDDetail RD ON RD.RFDID = RH.RFDID
                               AND RD.DUID = DUV.DUID
    WHERE CO.OrderID = 100
    GROUP BY J.JobOrderID
           , J.StatusID
    ) A ON J.JobOrderID = A.JobOrderID