T-SQL子ID的匹配父母身份

Question

我有一些孤兒記錄，我需要做成父記錄，但首先我需要基於用戶名的後續記錄有用戶名的第一個實例的ID，然後我會變成一個父記錄，我得到這個至今：

DECLARE @Test TABLE 

(
ID INT 
,UserName NVARCHAR(30) 
,FileID INT 



) 
INSERT INTO @Test VALUES (1,'TT',1) 
INSERT INTO @Test VALUES (2,'TT',2) 
INSERT INTO @Test VALUES (3,'TT',3) 
INSERT INTO @Test VALUES (4,'WW',4) 
INSERT INTO @Test VALUES (5,'WW',5) 
INSERT INTO @Test VALUES (6,'WW',6) 
INSERT INTO @Test VALUES (7,'WW',7) 
; 
WITH CTE 
AS 
(
    SELECT *,ROW_NUMBER() OVER(Partition by UserName Order by UserName) RN 

    from @Test 
) 
SELECT * 
    FROM CTE 
    ORDER BY Id ASC 

而且我希望得到這樣的：

ID UserName FileID RN 
1 TT   1  1 
2 TT   1  2 
3 TT   1  3 
4 WW   4  1 
5 WW   4  2 
6 WW   4  3 
7 WW   4  4 

我希望更新的ID列從：

ID UserName FileID 
627 TT    626 
628 TT    626 
629 TT    626 
461 WW    460 
462 WW    460 
463 WW    460 
464 WW    460 

要這樣：

ID UserName FileID 
627 TT   627 
628 TT   627 
629 TT   627 
461 WW   461 
462 WW   461 
463 WW   461 
464 WW   461 

Answer 1

使用排名

WITH CTE 
AS 
(
    SELECT ID,USERNAME,RANK() OVER (ORDER BY USERNAME) AS FILEID, 
    ROW_NUMBER() OVER(PARTITION BY USERNAME Order by UserName) RN 

    from @Test 
) 
SELECT * 
    FROM CTE 
    ORDER BY Id ASC 

Answer 2

DECLARE @Test TABLE 

(
ID INT 
,UserName NVARCHAR(30) 
,FileID INT 



) 
INSERT INTO @Test VALUES (627,'TT',626) 
INSERT INTO @Test VALUES (628,'TT',626) 
INSERT INTO @Test VALUES (629,'TT',626) 
INSERT INTO @Test VALUES (461,'WW',460) 
INSERT INTO @Test VALUES (462,'WW',460) 
INSERT INTO @Test VALUES (463,'WW',460) 
INSERT INTO @Test VALUES (464,'WW',460) 
; 

UPDATE T 
SET FILEID = (SELECT TOP 1 ID FROM @Test TT WHERE T.FILEID = TT.FILEID) 
FROM @Test T; 

SELECT * FROM @Test ORDER BY ID 

結果：

ID UserName FileID 
461  WW  461 
462  WW  461 
463  WW  461 
464  WW  461 
627  TT  627 
628  TT  627 
629  TT  627