Question

我有以下简化表：

╔══════════╦═══════════╗═══════════╗═══════════╗
║ Dough    ║ Material  ║ PerCharge ║ Perc      ║
╠══════════╬═══════════╣═══════════╣═══════════╣
║ DG10001  ║ GR002152  ║ 2,00      ║           ║ 
║ DG10001  ║ GR000133  ║ 9,00      ║           ║ 
║ DG10001  ║ GR000133  ║ 9,00      ║           ║ 
║ DG10002  ║ GR002152  ║ 2,50      ║           ║ 
╚══════════╩═══════════╝═══════════╝═══════════╝

面团材料是一对多的关系，PerCharge是每个容器使用的原材料重量。

我想根据用于每个独特面团的总和来计算每一行的百分比。

我已使用以下方法计算百分比

SELECT D.Dough
       ,Material
       ,PerCharge
       ,PerCharge/Total as Percentage
  FROM 
(Select Dough
       ,sum(PerCharge) as Total
From [PP_Materials].[dbo].[Deegregels]

group by Dough
) as D

left join

(SELECT Dough
      ,Material
     ,PerCharge
FROM [PP_Materials].[dbo].[Deegregels]
) as D2
On D.Dough = D2.Dough

order by D.Dough

现在，我只需要更新原始表以包括此计算出的百分比，但是我不知道如何制定更新语句。

感谢您提供的任何帮助。

编辑：简化示例的结果

╔══════════╦═══════════╗═══════════╗═══════════╗
║ Dough    ║ Material  ║ PerCharge ║ Perc      ║
╠══════════╬═══════════╣═══════════╣═══════════╣
║ DG10001  ║ GR002152  ║ 2,00      ║     10%   ║ 
║ DG10001  ║ GR000133  ║ 9,00      ║     45%   ║ 
║ DG10001  ║ GR000133  ║ 9,00      ║     45%   ║ 
║ DG10002  ║ GR002152  ║ 2,50      ║     10%   ║ 
╚══════════╩═══════════╝═══════════╝═══════════╝

Answer 1

更简洁的版本：

USE Sandbox;
GO
--Create sample table and data
CREATE TABLE #Dough (Dough varchar(10),
                     Material varchar(10),
                     PerCharge decimal(5,2),
                     Perc decimal(3,2));

INSERT INTO #Dough (Dough,
                    Material,
                    PerCharge)
VALUES ('DG10001','GR002152',2.00), 
       ('DG10001','GR000133',9.00), 
       ('DG10001','GR000133',9.00), 
       ('DG10002','GR002152',2.50);
GO
--The solution

WITH CTE AS(
    SELECT D.Dough, D.Material, D.PerCharge, Perc,
           PerCharge / SUM(PerCharge) OVER (PARTITION BY Dough) AS NewPerc
    FROM #Dough D)
UPDATE CTE
SET Perc = NewPerc
GO
--Check the data
SELECT *
FROM #Dough
GO
--Clean up
DROP TABLE #Dough;

使用窗口功能时，无需扫描表两次。

Answer 2

您应该可以尝试以下操作：

CREATE TABLE #Dough
(
    Dough VARCHAR(10) NULL,
    PerCharge DECIMAL(10,2) NULL,
    [Percentage] DECIMAL(10,2) NULL
)

INSERT INTO #Dough
VALUES
('DG10001',2,NULL),('DG10001',9,NULL),('DG10001',9,NULL),('DG10002',2,NULL)

SELECT *
FROM #Dough

;WITH Total AS
(
    SELECT   Dough
            ,Total = SUM(PerCharge)
    FROM #Dough
    GROUP BY Dough
)
UPDATE D1
SET [Percentage] = D1.PerCharge/T1.Total
FROM #Dough D1
JOIN Total  T1 ON D1.Dough = T1.Dough

Answer 3

您也可以将其包装到cte

with updatestatement as  (SELECT D.Dough
       ,Material
       ,PerCharge
       ,PerCharge/Total as Percentage
  FROM 
(Select Dough
       ,sum(PerCharge) as Total
From [dbo].[Deegregels]

group by Dough
) as D

left join

(SELECT Dough
      ,Material
     ,PerCharge
FROM [dbo].[Deegregels]
) as D2
On D.Dough = D2.Dough
)

update b
set perc = a.percentage

from updatestatement a inner join dbo.[Deegregels] b on a.dough = b.dough and a.material = b.material

更新表格以包含计算出的百分比

3 个答案: