從目前編號總和

Question

我沒有得到任何回報，任何人都可以看到我失蹤的簡單婷？

SELECT SUM(Amount * InPrice) AS TotalItemsOrdered 
FROM tblMaterial 
WHERE [tblMaterial].[OwnerId] = [tblTask].[Id] 

我需要做不同的事情得到一個結果？

希望有一個簡單的答案....是我新在這個:)

Answer 1

您需要用兩個表中選擇或不JOIN

選擇選項：

SELECT SUM(Amount * InPrice) AS TotalItemsOrdered 
FROM [tblMaterial], [tblTask] 
WHERE [tblMaterial].[OwnerId] = [tblTask].[Id] 

加盟選項：

SELECT SUM(Amount * InPrice) AS TotalItemsOrdered 
FROM [tblMaterial] 
INNER JOIN [tblTask] ON [tblMaterial].[OwnerId] = [tblTask].[Id] 

您可能還需要前綴SUM函數列與表名，如果他們發生在兩個表中。

在這裏，你可以閱讀更多有關SQL連接：

• https://technet.microsoft.com/en-us/library/ms191472(v=sql.105).aspx
• https://technet.microsoft.com/en-us/library/ms191517(v=sql.105).aspx
• https://www.mssqltips.com/sqlservertip/1667/sql-server-join-example/

Answer 2

的tblTask​​是從您選擇失蹤。

試試這個：

SELECT SUM(Amount * InPrice) AS TotalItemsOrdered 
FROM tblMaterial, tblTask 
WHERE tblMaterial.OwnerId = tblTask.Id 

或者使用聯接：

SELECT SUM(Amount * InPrice) AS TotalItemsOrdered 
FROM tblMaterial 
INNER JOIN tblTask 
ON tblMaterial.OwnerId = tblTask.Id 

Answer 3

只要把GROUP BY如果你想SUM每ID

SELECT tblMaterial.OwnerId 
    , SUM(Amount * InPrice) AS TotalItemsOrdered 
FROM tblMaterial INNER JOIN tblTask ON tblMaterial.OwnerId = tblTask.Id 
GROUP BY tblMaterial.OwnerId