Question

我尝试使用 UNION ，但只返回 P4 的结果。我现在拥有的是 4个单独的SELECT个查询，它们与GROUP BY和P3 P4具有相同的数据>。因此，我想将这些数据合并到 ONE 临时表中。

如何：

首先将这些表合并到一个表中
然后是每个工厂的SUM（）列

如下图所示。

Merge1

SQL：

DECLARE @Plants TABLE
(
    PlantName nvarchar(30),
    MaterialTotalPrice DECIMAL(18,2),
    SumLaborCost DECIMAL(18,2),
    FinalCost DECIMAL(18,2)
)

DECLARE @PlantName nvarchar(30)
DECLARE @MaterialTotalPrice DECIMAL(18,2)
DECLARE @SumLaborCost DECIMAL(18,2)
DECLARE @FinalCost DECIMAL(18,2)

SELECT
    @PlantName = GetTotalPrice.[PlantName]
    ,@MaterialTotalPrice = SUM(GetTotalPrice.[MaterialTotalPrice])
    ,@SumLaborCost = SUM(GetTotalPrice.[SumLaborCost])
    ,@FinalCost = SUM(GetTotalPrice.[FinalCost])
FROM
(

    SELECT
        TotalPriceMP4.[PlantName]
        ,SUM(TotalPriceMP4.[MaterialTotalPrice]) AS 'MaterialTotalPrice'
        ,SUM(TotalPriceMP4.[SumLaborCost]) AS 'SumLaborCost'
        ,SUM(TotalPriceMP4.[FinalCost]) AS 'FinalCost'
    FROM Invoice1 AS TotalPriceMP4
    GROUP BY TotalPriceMP4.[PlantName]
    UNION
    SELECT
        TotalPriceMP4.[PlantName]
        ,SUM(TotalPriceMP4.[MaterialTotalPrice]) AS 'MaterialTotalPrice'
        ,SUM(TotalPriceMP4.[SumLaborCost]) AS 'SumLaborCost'
        ,SUM(TotalPriceMP4.[FinalCost]) AS 'FinalCost'
    FROM Invoice2 AS TotalPriceMP4
    GROUP BY TotalPriceMP4.[PlantName]
    UNION
    SELECT
        TotalPriceMP3.[PlantName]
        ,SUM(TotalPriceMP3.[MaterialTotalPrice]) AS 'MaterialTotalPrice'
        ,SUM(TotalPriceMP3.[SumLaborCost]) AS 'SumLaborCost'
        ,SUM(TotalPriceMP3.[FinalCost]) AS 'FinalCost'
    FROM Invoice3 AS TotalPriceMP3
    GROUP BY TotalPriceMP3.[PlantName]
    UNION
    SELECT
        TotalPriceMP3.[PlantName]
        ,SUM(TotalPriceMP3.[MaterialTotalPrice]) AS 'MaterialTotalPrice'
        ,SUM(TotalPriceMP3.[SumLaborCost]) AS 'SumLaborCost'
        ,SUM(TotalPriceMP3.[FinalCost]) AS 'FinalCost'
    FROM Invoice4 AS TotalPriceMP3
    GROUP BY TotalPriceMP3.[PlantName]

) AS GetTotalPrice
GROUP BY GetTotalPrice.[PlantName]
INSERT INTO @Plants(PlantName, 
                    MaterialTotalPrice, 
                    SumLaborCost, 
                    FinalCost) 
 VALUES (@PlantName, 
         ISNULL(@MaterialTotalPrice,0), 
         ISNULL(@SumLaborCost,0), 
         ISNULL(@FinalCost,0))
SELECT * FROM @Plants

Answer 1

你接近你的工作，你只需再次分组选择

合并： - 在一个屋檐下进行多次进入是一件好事。

为什么使用临时表？如果没有临时表，你会得到理想的东西。

declare @t table ( planname varchar(50), finalcost float)
declare @t1 table ( planname varchar(50), finalcost float)
declare @t2 table ( planname varchar(50), finalcost float)
declare @t3 table ( planname varchar(50), finalcost float)

insert into @t values ( 'P3', 851872.651973)
insert into @t1 values ( 'P3', 1219860.129705)
insert into @t2 values ( 'P4', 7569113.509084)
insert into @t3 values ( 'P4', 24701896.712498)

select planname, SUM(finalcost)  from 
(
select planname, SUM(finalcost) finalcost from @t group by planname
union
select planname, SUM(finalcost) from @t1 group by planname
union
select planname, SUM(finalcost) from @t2 group by planname
union
select planname, SUM(finalcost) from @t3 group by planname
) 
a group by planname

Answer 2

知道什么时候不要单独使用union非常重要。

declare @t table ( planname varchar(50), finalcost float)
declare @t1 table ( planname varchar(50), finalcost float)
declare @t2 table ( planname varchar(50), finalcost float)
declare @t3 table ( planname varchar(50), finalcost float)

insert into @t values ( 'P3', 100.00)
insert into @t1 values ( 'P3', 100.00)
insert into @t2 values ( 'P3', 100.00)
insert into @t3 values ( 'P3', 100.00)

select planname, SUM(finalcost)  from 
(
select planname, SUM(finalcost) finalcost from @t group by planname
union ALL
select planname, SUM(finalcost) from @t1 group by planname
union ALL
select planname, SUM(finalcost) from @t2 group by planname
union ALL
select planname, SUM(finalcost) from @t3 group by planname
) 
a group by planname
;

结果= 400

如果您单独使用union，则结果为100.00

如何使用SUM（）并使用SQL将表合并到一个表中？

2 个答案: