Справка по SQL - возврат дубликатов из объединения

Question

Мой SQL-запрос объединяется в нескольких таблицах, и поэтому он отображает несколько результатов.Я знаю о SELECT DISTINCT, но одно из полей ('Account.Name') иногда отличается, поэтому он обрабатывает эту запись как новую строку.Есть идеи?Вот мой SQL:

    SELECT DISTINCT 
                      d.ID, ISNULL(d.OnHold, 0) AS 'OnHold', d.OnHoldReason AS 'On Hold Reason', d.LegacyID AS 'Consignment#', d.IntConNo AS 'Consignment Ref', 
                      CASE WHEN JobType = 'O' THEN 'Outward' ELSE 'Collection' END AS 'Job Type', d.TripDate AS 'Delivery Date', d.DeliveryTown AS 'Delivery Town', 
                      d.DeliveryPostcode AS 'Delivery Postcode', d.VehicleReg AS 'Vehicle Reg', d.RequiredCollectionDate AS 'Req. Collection Date', 
                      d.VehicleReg AS 'Vehicle Registration', CASE WHEN d .DeliveryStatus = 2 THEN 'OK' END AS 'Delivery Status', d.ItemsignedBy AS 'POD Signed By', 
                      d.BaseRate AS 'Base Rate', d.FuelSurcharge AS 'Fuel Surcharge', d.AdditionalCharges AS 'Additional Charges', 
                      d.BaseRate + d.FuelSurcharge + d.AdditionalCharges AS 'Value', CASE WHEN InvoiceNumber IS NULL THEN CONVERT(bit, 0) ELSE CONVERT(bit, 1) 
                      END AS Tagged, CASE WHEN di.Total = di.Delivered THEN 'Recieved' ELSE 'Not Recieved' END AS 'Items', Account.Name
FROM         Deliveries AS d LEFT OUTER JOIN
                          (SELECT     Consignment, COUNT(*) AS Total, COUNT(CASE WHEN Status = 2 THEN 1 END) AS Delivered
                            FROM          Items
                            GROUP BY Consignment) AS di ON d.ID = di.Consignment INNER JOIN
                      Account ON d.Customer = Account.InvoiceAccount
WHERE     (d.InvoiceNumber IS NULL) AND (d.TripDate > 29 / 11 / 2010)
ORDER BY 'Consignment#'

Answer 1

Самым простым решением было бы заменить DISTINCT на GROUP BY.Недостатком является то, что возвращается только одно имя учетной записи.

Другие решения могут быть

• создать функцию, возвращающую объединенные имена учетных записей
• , использовать вспомогательный выбор, чтобы вернуть только одно имя

Использование группировки по

SELECT  d.ID
        , ISNULL(d.OnHold, 0) AS 'OnHold'
        , d.OnHoldReason AS 'On Hold Reason'
        , d.LegacyID AS 'Consignment#'
        , d.IntConNo AS 'Consignment Ref'
        , CASE WHEN JobType = 'O' THEN 'Outward' ELSE 'Collection' END AS 'Job Type'
        , d.TripDate AS 'Delivery Date'
        , d.DeliveryTown AS 'Delivery Town'
        , d.DeliveryPostcode AS 'Delivery Postcode'
        , d.VehicleReg AS 'Vehicle Reg'
        , d.RequiredCollectionDate AS 'Req. Collection Date'
        , d.VehicleReg AS 'Vehicle Registration'
        , CASE WHEN d .DeliveryStatus = 2 THEN 'OK' END AS 'Delivery Status', d.ItemsignedBy AS 'POD Signed By'
        , d.BaseRate AS 'Base Rate'
        , d.FuelSurcharge AS 'Fuel Surcharge'
        , d.AdditionalCharges AS 'Additional Charges'
        , d.BaseRate + d.FuelSurcharge + d.AdditionalCharges AS 'Value'
        , CASE WHEN InvoiceNumber IS NULL THEN CONVERT(bit, 0) ELSE CONVERT(bit, 1) END AS Tagged
        , CASE WHEN di.Total = di.Delivered THEN 'Recieved' ELSE 'Not Recieved' END AS 'Items'
        , MIN(Account.Name)
FROM    Deliveries AS d 
        LEFT OUTER JOIN (
          SELECT  Consignment
                  , COUNT(*) AS Total
                  , COUNT(CASE WHEN Status = 2 THEN 1 END) AS Delivered
          FROM    Items
          GROUP BY 
                  Consignment
        ) AS di ON d.ID = di.Consignment 
        INNER JOIN Account ON d.Customer = Account.InvoiceAccount
WHERE   (d.InvoiceNumber IS NULL) 
        AND (d.TripDate > 29 / 11 / 2010)
GROUP BY
        d.ID
        , ISNULL(d.OnHold, 0)
        , d.OnHoldReason
        , d.LegacyID
        , d.IntConNo
        , CASE WHEN JobType = 'O' THEN 'Outward' ELSE 'Collection' END
        , d.TripDate
        , d.DeliveryTown
        , d.DeliveryPostcode
        , d.VehicleReg
        , d.RequiredCollectionDate
        , d.VehicleReg
        , CASE WHEN d .DeliveryStatus = 2 THEN 'OK' END AS 'Delivery Status', d.ItemsignedBy
        , d.BaseRate
        , d.FuelSurcharge
        , d.AdditionalCharges
        , d.BaseRate + d.FuelSurcharge + d.AdditionalCharges
        , CASE WHEN InvoiceNumber IS NULL THEN CONVERT(bit, 0) ELSE CONVERT(bit, 1) END
        , CASE WHEN di.Total = di.Delivered THEN 'Recieved' ELSE 'Not Recieved' END
ORDER BY 
        'Consignment#'