Question

我有下表：

Id  CategoryId  Code  Status
=================================
1   A100        0012  NULL
2   A100        0012  NULL
3   A100        0055  NULL
4   A100        0012  NULL
5   B201        1116  NULL
6   B201        1116  NULL
7   B201        1121  NULL
8   B201        1024  NULL

逻辑：1。对于相同的CategoryID，代码应该相同。 2.如果存在多个代码，请考虑具有最低值的代码。

期望的结果：

Id  CategoryId  Code  Status
=================================
1   A100        0012  NULL
2   A100        0012  NULL
3   A100        0055  FAIL
4   A100        0012  NULL
5   B201        1116  FAIL
6   B201        1116  FAIL
7   B201        1121  FAIL
8   B201        1024  NULL

由于

Answer 1

按照您的编辑...

DECLARE @T TABLE
(
ID INT,
CategoryID CHAR(4),
Code CHAR(4),
Status CHAR(4) NULL
)
INSERT INTO @T (ID,CategoryID, Code)
SELECT 1,'A100',0012 UNION ALL SELECT 2,'A100',0012 UNION ALL
SELECT 3,'A100',0055 UNION ALL SELECT 4,'A100',0012 UNION ALL
SELECT 5,'B201',1116 UNION ALL SELECT 6,'B201',1116 UNION ALL
SELECT 7,'B201',1121 UNION ALL SELECT 8,'B201',1024;

WITH T AS
(
SELECT *, MIN(Code) OVER (PARTITION BY CategoryID ) AS MinCode
from @T
)
UPDATE T
SET Status = 'FAIL'
WHERE Code <> MinCode

SELECT *
FROM @T

返回

ID          CategoryID Code Status
----------- ---------- ---- ------
1           A100       12   NULL
2           A100       12   NULL
3           A100       55   FAIL
4           A100       12   NULL
5           B201       1116 FAIL
6           B201       1116 FAIL
7           B201       1121 FAIL
8           B201       1024 NULL

Answer 2

我会采取刺，但我真的认为这应该是一个新问题。

;WITH o AS 
(
    SELECT Id, CategoryId, Code, Status, 
    rn = ROW_NUMBER() OVER (PARTITION BY CategoryId ORDER BY Id)
    FROM dbo.my_table
),
n AS 
(
    SELECT CategoryId, Code
    FROM o WHERE rn = 1
)
UPDATE o 
    SET [Status] = 'FAILURE'
    FROM o INNER JOIN n
    ON o.CategoryId = n.CategoryId 
    AND o.Code <> n.Code
    WHERE o.rn > 1;

根据其他行的值更新列

2 个答案: