SQL Server - 在复杂查询中使用Over/Partion

我们有很多复杂的查询，它们涉及很多实现为视图的列和连接（请参见下面的示例）。SQL Server - 在复杂查询中使用Over/Partion

在某些情况下，这些查询返回重复的行，然后必须通过消费应用程序以编程方式删除。因此，我们希望增强SQL查询以消除重复项，并加快检索过程。

我知道我可以使用OVER/PARTITION BY逻辑来做到这一点，但我不确定如何修改查询以获得工作语法。

下面是一个例子：

SELECT 
    Main.MfgOrder.OrderNumber, 
    Main.MfgOrder.DesignBOMID, 
    Main.Design_Plant.PlantID, 
    Main.MfgOrder_Operation.OrderOpID, 
    Main.MfgOrder_Operation.DesignOpID, 
    Main.MfgOrder_Operation.OpSeq, 
    Main.MfgOrder_Operation.Description, 
    Main.MfgOrder_Operation.CompletionStatus, 
    Main.MfgOrder__Shift.OrderShiftID, 
    Main.MfgOrder__Shift.WorkCenterMachineID, 
    Main.MfgOrder___Event.OrderEventID, 
    Main.MfgOrder____Reel.OrderReelID, 
    Main.MfgOrder____Reel.ReelNumber, 
    Main.MfgOrder____Reel.Location, 
    Main.MfgOrder____Reel.Test_Status AS Test_Status_Reel, 
    Main.MfgOrder____Reel.Test_Disposition AS Test_Disposition_Reel, 
    Main.MfgOrder____Reel.LabReleased, 
    Main.MfgOrder____Reel.ShipReelsBypassSet, 
    Main.MfgOrder_____Length.OrderLengthID, 
    Main.MfgOrder_____Length.LengthType, 
    Main.MfgOrder_____Length.LocationOnReel, 
    Main.MfgOrder_____Length.LocationOnLength, 
    Main.MfgOrder_____Length.TrialNumber, 
    Main.MfgOrder_____Length.SampleNumber, 
    Main.MfgOrder_____Length.PrintNumber, 
    Main.MfgOrder_____Length.Test_Status AS Test_Status_Length, 
    Main.MfgOrder_____Length.Test_Category, 
    Main.MfgOrder_____Length.Test_Disposition AS Test_Disposition_Length, 
    Main.MfgOrder_____Length.SampleSubmittedBy, 
    Main.MfgOrder_____Length.SampleSubmittedDate, 
    Main.MfgOrder_____Length.BypassTesting, 
    Main.MfgOrder_____Length_OperatorQty.Sample1Destination, 
    Main.MfgOrder_____Length_OperatorQty.Sample2Destination, 
    Main.MfgOrder_____Length_OperatorQty.Sample3Destination, 
    Main.MfgOrder______Component.OrderComponentID, 
    Main.MfgOrder______Component.DesignComponentID, 
    Main.MfgOrder______Component.ItemNo, 
    Main.MfgOrder_______Test.LabTestID, 
    Main.MfgOrder_______Test.OrderTestID, 
    Main.MfgOrder_______Test.TestComplete, 
    Main.MfgOrder_______Test.TestStatus, 
    Main.MfgOrder________Marker2.OrderMarkerID, 
    Master.Color.ColorName, 
    Master.LabTest.ExcludeFromPassFail, 
    CASE 
     WHEN Main.Design_Component.Component_Label IS NULL 
      THEN 'Unknown' 
      ELSE Main.Design_Component.Component_Label 
    END AS Component_Label 
FROM 
    Main.MfgOrder 
INNER JOIN 
    Main.Design__BOM ON Main.MfgOrder.DesignBOMID = Main.Design__BOM.DesignBOMID 
INNER JOIN 
    Main.Design_Plant ON Main.Design__BOM.DesignPlantID = Main.Design_Plant.DesignPlantID 
INNER JOIN 
    Main.MfgOrder_Operation ON Main.MfgOrder.OrderNumber = Main.MfgOrder_Operation.OrderNumber 
INNER JOIN 
    Main.MfgOrder__Shift ON Main.MfgOrder_Operation.OrderOpID = Main.MfgOrder__Shift.OrderOpID 
INNER JOIN 
    Main.MfgOrder___Event ON Main.MfgOrder__Shift.OrderShiftID = Main.MfgOrder___Event.OrderShiftID 
INNER JOIN 
    Main.MfgOrder____Reel ON Main.MfgOrder___Event.OrderEventID = Main.MfgOrder____Reel.OrderEventID 
INNER JOIN 
    Main.MfgOrder_____Length ON Main.MfgOrder____Reel.OrderReelID = Main.MfgOrder_____Length.OrderReelID 
LEFT OUTER JOIN 
    Main.MfgOrder______Component ON Main.MfgOrder_____Length.OrderLengthID = Main.MfgOrder______Component.OrderLengthID 
LEFT OUTER JOIN 
    Main.MfgOrder_______Test ON Main.MfgOrder______Component.OrderComponentID = Main.MfgOrder_______Test.OrderComponentID 
LEFT OUTER JOIN 
    Main.MfgOrder________Marker2 ON Main.MfgOrder_______Test.OrderTestID = Main.MfgOrder________Marker2.OrderTestID 
LEFT OUTER JOIN 
    Main.Design_Component ON Main.MfgOrder______Component.DesignComponentID = Main.Design_Component.DesignComponentID 
LEFT OUTER JOIN 
    Master.Color ON Main.MfgOrder______Component.TapeColorID = Master.Color.ColorNumber 
LEFT OUTER JOIN 
    Master.LabTest ON Main.MfgOrder_______Test.LabTestID = Master.LabTest.LabTestID 
LEFT OUTER JOIN 
    Main.MfgOrder_____Length_OperatorQty ON Main.MfgOrder______Component.OrderLengthID = Main.MfgOrder_____Length_OperatorQty.OrderLengthID

来源

2017-05-31 Richard B. Sorensen

哪个ID列显示为重复？它可能只是可以在连接中解析。但是，如果您可以告知哪个ID是重复的，应该能够协助您提出的问题。 – Leonidas199x

over分区与聚合有意义，在这种情况下，我不认为你可以使用窗口函数 – Jayvee

您可以按以下使用ROW_NUMBER：下面的查询将不仅ORDERNUMBER选择重复的，如果你需要添加你添加相应

Select * from (
    Select 
     RowN = Row_Number() over(partition by Main.MfgOrder.OrderNumber order by Main.MfgOrder.OrderNumber), 
     --- All your select columns and all your query with joins 
) a 
    Where a.RowN = 1

来源

2017-05-31 16:12:28

OP不问如何重复数据删除，但如何改进查询以避免重复使用 – Jayvee

尝试使用查询创建表并使用row_number 。 –

以上问题的答案： –

其他列整行是否完全重复？如果是的话只需添加DISTINCT

SELECT DISTINCT 
    ... 
FROM 
    ...

如果您得到大多数列相同的，但一些列不同，那么GROUP BY是相同的，并选择MIN(column_name)对于那些造成额外行的那些列重复的行出现。

来源

2017-05-31 16:20:22 Skippy

SQL Server - 在复杂查询中使用Over/Partion

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