如果其中一個字段在SQL中具有多個相同值，如何更新值

Question

在我的數據庫表中，其中一個字段具有相同的值。我想用隨機數字或字符串來改變這個值，這個數字或字符串被附加到這個字段值以獲得唯一性。

樣本數據 這裏'Ma' has 5 records等等。我想改變名稱Ma01, Ma02等

Id Name Count 
1 Ma 5 
2 Ga 6 
3 Gu 5 

如何與SQL查詢

Answer 1

試試這個

UPDATE TBL 
SET Name = A.Name 
FROM 
(
    SELECT 
     Id, 
     Name + CAST(ROW_NUMBER() OVER (PARTITION BY Name ORDER BY (SELECT NULL)) AS NVARCHAR(500)) AS NAME, 
     Count 
    FROM 
     TBL 
    WHERE 
     NAME IN 
     (
      SELECT T.NAME FROM TBL T 
      GROUP BY T.NAME 
      HAVING COUNT(1) > 1 
     ) 

) A 
WHERE 
    TBL.Id = A.ID 

Answer 2

做試試這個：

Select Name + convert(varchar(2), row_number()over(partition by Name order by Name)) 
From tablename 

Answer 3

你只要試試這個。

Declare @i int = 1 

update yourtable 
set ID = @i , @i = @i + 1 

Answer 4

選擇基於NEER代碼的代碼，添加前導零，在MSSQL數據庫上測試。

SELECT 
    Id, 
    Name, 
    Name + RIGHT('00'+CAST(ROW_NUMBER() OVER (PARTITION BY Name ORDER BY (SELECT Name)) AS NVARCHAR(MAX)),2) AS Updatedname 

FROM 
    tablename 
WHERE 
    Name IN 
    (
     SELECT T.NameFROM tablename T 
     GROUP BY T.Name 
     HAVING COUNT(Name) > 1 
    ) 
GROUP BY Name,Id 
ORDER BY Name