Question

我有两张桌子。我需要使用一些连接或子查询来加入它们。 “DWVertical Group”列（第2表）的值应来自第1个表。我该如何实现呢？

第一张表

    Declare @Date Date = ( Select Max(RecordDate) from dw_UtilizationPredictionReport)


    SELECT 
        t1.RecordDate,
        t1.DWVerticalGroup,
        t1.OnOff,
        t1.LocationGrouping,
        t1.WFMGrade,
        t1.BHRS,
        t1.AHRS,
        t1.OffTFTE,
        t1.OffBFTE,
        COALESCE(t2.CTFTE, 0) CTFTE,
        COALESCE(t2.OverallFTE, 0) OverallFTE,
        COALESCE(t3.ATFTE,0) ATFTE,
        COALESCE(t3.SATFTE,0) SATFTE,
        COALESCE(t4.WCTFTE,0) WCTFTE,
        COALESCE(PAQ.COST,0) PAQCOST
    FROM
    (
        SELECT RecordDate, DWVerticalGroup , OnOff, LocationGrouping, WFMGrade,
            SUM(BilledHrs) BHRS, SUM(AvailableHrs) AHRS, SUM(TotalFTE) OffTFTE,
            SUM(BilledFTE) OffBFTE
        FROM dw_UtilizationPredictionReport 
        WHERE RecordDate=@Date AND OnOff = 'Offshore'
        GROUP BY
            DWVerticalGroup, OnOff, LocationGrouping, WFMGrade, RecordDate
    ) t1

第二个表（'DWVertical Group'列的值应来自第一个表）

y_labels
1
4
4
3

Answer 1

你可以使用左连接来实现这个 -

Declare @Date Date = ( Select Max(RecordDate) from dw_UtilizationPredictionReport)


SELECT 
    t1.RecordDate,
    case when t2.VerticalNameGroup is not null then t1.DWVerticalGroup else 'Others' end as DWVerticalGroup ,
    t1.OnOff,
    t1.LocationGrouping,
    t1.WFMGrade,
    t1.BHRS,
    t1.AHRS,
    t1.OffTFTE,
    t1.OffBFTE,
    COALESCE(t2.CTFTE, 0) CTFTE,
    COALESCE(t2.OverallFTE, 0) OverallFTE,
    COALESCE(t3.ATFTE,0) ATFTE,
    COALESCE(t3.SATFTE,0) SATFTE,
    COALESCE(t4.WCTFTE,0) WCTFTE,
    COALESCE(PAQ.COST,0) PAQCOST
FROM
(
    SELECT RecordDate, DWVerticalGroup , OnOff, LocationGrouping, WFMGrade,
        SUM(BilledHrs) BHRS, SUM(AvailableHrs) AHRS, SUM(TotalFTE) OffTFTE,
        SUM(BilledFTE) OffBFTE
    FROM dw_UtilizationPredictionReport 
    WHERE RecordDate=@Date AND OnOff = 'Offshore'
    GROUP BY
        DWVerticalGroup, OnOff, LocationGrouping, WFMGrade, RecordDate
) t1

left join CDB_Verticals as t2
on t2.VerticalNameGroup = t1.DWVerticalGroup and ServiceLine='N'

使用子查询或连接加入

1 个答案: