SQL Server更新加入兩個表

Question

我有點麻煩讓MSSQL與我的意圖合作。

檢查以下...

重複

 
UseId | Use 
------------- 
2254 | Primary 
2255 | Primary 
2256 | Primary 
2257 | Intersection 
2258 | Monitor 
2259 | Primary 
2260 | Intersection 
2261 | Primary 
2264 | Monitor 
2269 | Secondary 

的唯一身份

 
UseID | Use 
-------------- 
2252 | Intersection 
2253 | Monitor 
2251 | Primary 
2262 | Secondary

多對多表

 
ID | FKey | UseId 
------------------- 
1 | 1 | 2251 
2 | 1 | 2252 
3 | 2 | 2253 
4 | 2 | 2262 
5 | 3 | 2254 
6 | 3 | 2257 
7 | 3 | 2258 
8 | 4 | 2255 
9 | 4 | 2260 
10 | 5 | 2259 
11 | 5 | 2269 

我想運行在更新查詢「多對多」表將與重複項和唯一標識符上的使用列相匹配，然後在多對多表中使用其唯一的UseId替換並「複製」UseId ...

生成的良好數據看起來像這樣... 。

好多對多表...

 
ID | FKey | UseId 
------------------- 
1 | 1 | 2251 
2 | 1 | 2252 
3 | 2 | 2253 
4 | 2 | 2262 
5 | 3 | 2251 
6 | 3 | 2252 
7 | 3 | 2253 
8 | 4 | 2251 
9 | 4 | 2262 
10 | 5 | 2251 
11 | 5 | 2262 

任何幫助表示讚賞

---

爲響應張貼一個答案......我在索姆困難。它似乎沒有工作。

update命令正在更改Many to many表中的記錄1-4（即使它們很好）...並且不更改任何其他記錄。

此腳本提供了一個問題的例子。

CREATE TABLE Uniques 
(
    UseID INT, 
    [Use] VARCHAR(50) 
) 

INSERT INTO Uniques (UseID, [Use]) VALUES (2254, 'Primary') 
INSERT INTO Uniques (UseID, [Use]) VALUES (2255, 'Primary') 
INSERT INTO Uniques (UseID, [Use]) VALUES (2256, 'Primary') 
INSERT INTO Uniques (UseID, [Use]) VALUES (2257, 'Intersection') 
INSERT INTO Uniques (UseID, [Use]) VALUES (2258, 'Monitor') 
INSERT INTO Uniques (UseID, [Use]) VALUES (2259, 'Primary') 
INSERT INTO Uniques (UseID, [Use]) VALUES (2260, 'Intersection') 
INSERT INTO Uniques (UseID, [Use]) VALUES (2261, 'Primary') 
INSERT INTO Uniques (UseID, [Use]) VALUES (2264, 'Monitor') 
INSERT INTO Uniques (UseID, [Use]) VALUES (2269, 'Secondary') 

CREATE TABLE Duplicates 
(
    UseID INT, 
    [Use] VARCHAR(50) 
) 

INSERT INTO Duplicates (UseID, [Use]) VALUES (2252, 'Intersection') 
INSERT INTO Duplicates (UseID, [Use]) VALUES (2253, 'Monitor') 
INSERT INTO Duplicates (UseID, [Use]) VALUES (2251, 'Primary') 
INSERT INTO Duplicates (UseID, [Use]) VALUES (2262, 'Secondary') 

CREATE TABLE ManyToMany 
(
    Id INT, 
    FKey INT, 
    UseId INT 
) 

INSERT INTO ManyToMany (Id, FKey, UseId) VALUES (1, 1, 2251) 
INSERT INTO ManyToMany (Id, FKey, UseId) VALUES (2, 1, 2252) 
INSERT INTO ManyToMany (Id, FKey, UseId) VALUES (3, 2, 2253) 
INSERT INTO ManyToMany (Id, FKey, UseId) VALUES (4, 2, 2262) 
INSERT INTO ManyToMany (Id, FKey, UseId) VALUES (5, 3, 2254) 
INSERT INTO ManyToMany (Id, FKey, UseId) VALUES (6, 3, 2257) 
INSERT INTO ManyToMany (Id, FKey, UseId) VALUES (7, 3, 2258) 
INSERT INTO ManyToMany (Id, FKey, UseId) VALUES (8, 4, 2255) 
INSERT INTO ManyToMany (Id, FKey, UseId) VALUES (9, 4, 2260) 
INSERT INTO ManyToMany (Id, FKey, UseId) VALUES (10, 5, 2259) 
INSERT INTO ManyToMany (Id, FKey, UseId) VALUES (11, 5, 2269) 

SELECT * FROM Uniques 
SELECT * FROM Duplicates 
SELECT * FROM ManyToMany 

UPDATE m 
SET  m.UseId = u.UseId 
FROM ManyToMany m 
     JOIN Duplicates d ON m.UseId = d.UseId 
     JOIN Uniques u ON d.[Use] = u.[Use]; 

SELECT * FROM ManyToMany 

DROP TABLE Uniques 
DROP TABLE Duplicates 
DROP TABLE ManyToMany 

Answer 1

UPDATE m 
SET  m.UseId = u.UseId 
FROM ManyToMany m 
     JOIN Duplicates d ON m.UseId = d.UseId 
     JOIN Uniques u ON d.[Use] = u.[Use];