SQL - 使用公共密鑰在同一表中減去2行

Question

擁有包含三列的數據庫 - gamekey，組隊，最​​終得分。我試圖找出每個遊戲鍵的分數差異。

 
Gamekey. Teamed. Finalscore 
16  27  21 
16  7  24 
17  22  17 
17  21  10 
18  15  9 
18  11  3 

慾望輸出將

 
Gamekey. Scorediff 
16   3 
17   7 
18   6 

Answer 1

看起來像你想的差的絕對值，所以你可以使用;

SELECT Gamekey, max(Finalscore) - min(Finalscore) as Scorediff 
FROM TableName 
GROUP BY Gamekey 

- 增加了下面的驗證你跑（授予以下是在SQL Server的測試）

declare @testTable as table(Gamekey int, Teamed int, Finalscore int) 

INSERT INTO @testTable values(16,27,21) 
INSERT INTO @testTable values(16,7,24) 
INSERT INTO @testTable values(17,22,17) 
INSERT INTO @testTable values(17,21,10) 
INSERT INTO @testTable values(18,15,9) 
INSERT INTO @testTable values(18,11,3) 


SELECT Gamekey, max(Finalscore) - min(Finalscore) as Scorediff 
FROM @testTable 
GROUP BY Gamekey 

Answer 2

Create table Shop 
(
    ItemCode varchar(10)not null, 
    ShopName Varchar(50) not null, 
    Items varchar(50) not null, 
    Quantity int not null, 
    OrderDate datetime NOT NULL DEFAULT GETDATE(), 
    UpdateDate varchar(11)not null 
) 
GO 

Create Table Product 
(
    ProductCode varchar(10)Primary key, 
    ShopName varchar(50), 
    Product varchar(50), 
    Quantity int , 
    UnitPrice money , 
    Defects int , 
    Remainders int , 
    TotalPrice money , 
    Benefit money , 
    OrderDate datetime NOT NULL DEFAULT GETDATE(), 
    UpdateDate varchar(11) 
) 
GO 
Create Table ProductSold 
(
    ShopName varchar(50)not null, 
    Product varchar(50) not null, 
    Quantity int not null, 
    UnitPrice money not null, 
    TotalPrice money not null, 
    OrderDate datetime NOT NULL DEFAULT GETDATE() 
) 

1. 我想從產品（餘數）當店（減去數量）表插入到其表中。
2. 我想從Shop（Quantity）表中減去ProductSold（Quantity）插入時的值。