T-SQL子ID的匹配父母身份

Question

我有一些孤儿记录，我需要做成父记录，但首先我需要基于用户名的后续记录有用户名的第一个实例的ID，然后我会变成一个父记录，我得到这个至今：

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 

而且我希望得到这样的：

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列从：

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

要这样：

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 

结果：

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