如果其中一个字段在SQL中具有多个相同值，如何更新值

Question

在我的数据库表中，其中一个字段具有相同的值。我想用随机数字或字符串来改变这个值，这个数字或字符串被附加到这个字段值以获得唯一性。

样本数据 这里'Ma' has 5 records等等。我想改变名称Ma01, Ma02等

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

如何与SQL查询

Answer 1

试试这个

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

做试试这个：

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

Answer 3

你只要试试这个。

Declare @i int = 1 

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

Answer 4

选择基于NEER代码的代码，添加前导零，在MSSQL数据库上测试。

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