SQL更新加入另一個表

Question

我有一個Location表中的SQL Server：

LocationId | LocationName | Address 
    ======================================== 
     15   AA   111 AAA 
     17   CC   999 CCC 

而且我有一個Worksite表WorksiteMark = Null

WorksiteId | WorksiteName | Address | LocationId | WorksiteMark 
    ====================================================================== 
     1   AA   111 AAA   15   Null 
     2   P   23 P   15   Null 
     3   F   78 F   15   Null 
     4   H   16 H   17   Null 
     5   CC   999 CCC   17   Null 
     6   W   78 W   17   Null 

最後我需要更新WorksiteMark = WorksiteId參考Location表，我將刪除Location表

WorksiteId | WorksiteName | Address | WorksiteMark 
    ======================================================== 
     1   AA   111 AAA   1 
     2   P   23 P    1 
     3   F   78 F    1 
     4   H   16 H    5 
     5   CC   999 CCC   5 
     6   W   78 W    5 

你能幫我創建一個腳本來更新WorksiteMark = WorksiteId引用Location表嗎？

感謝

Answer 1

你需要一個雙JOIN與您的更新，類似;

UPDATE W 
SET W.WorksiteMark = W2.WorksiteId 
FROM Worksite AS W 
INNER JOIN Location AS L 
     ON L.LocationId = W.LocationId 
INNER JOIN Worksite AS W2 
     ON W2.WorksiteName = L.LocationName 

Answer 2

希望這適用於你。

Update W 
SET W.WorksiteMark = L1.WorksiteId 
FROM #Worksite AS W 
INNER JOIN (Select L.LocationId,W2.WorksiteId FROM #Location L INNER JOIN 
      #Worksite W2 ON L.LocationName = W2.WorkSiteName) AS L1 
    ON W.LocationId = l1.LocationId 

Answer 3

UPDATE [dbo].[Worksite] 
SET WorksiteMark = (SELECT WorksiteId FROM [dbo].[Worksite] B WHERE B.WorksiteNAME = [dbo].[Location].LocationName) 
from [dbo].[Worksite] 
inner join [dbo].[Location] on [dbo].[Location].[LocationId] = [dbo].[Worksite].LocationId