Question

我有一张表格如下

ID Name Code
1   x     y
5   c     v
3   v     h
10  k     4
23  m     g

现在我想重新订购5000以下的号码

ID Name Code
5001   x     y
5002   c     v
5003   v     h
5004   k     4
5005   m     g

什么是最快的查询SQL Server来处理这个，因为该表包含超过百万行？

Answer 1

试试这个解决方案

declare @a as int;
SET @a = 5000;  
    UPDATE tablename SET @a=id=@a+1;

Answer 2

使用cursor更新表中的所有行

 DECLARE @i int=5000
DECLARE cur cursor FAST_FORWARD READ_ONLY
FOR
 SELECT  id
FROM tbl
DECLARE @d varchar(50)
OPEN cur
 FETCH NEXT FROM cur INTO @d
 WHILE @@FETCH_STATUS=0
 BEGIN 
UPDATE dbo.tbl
SET id=@i+1
WHERE id=@d

FETCH NEXT FROM cur  INTO @d
END
Close  cur 
DEALLOCATE cur
SELECT * FROM tbl

Answer 3

使用此查询。

UPDATE A SET A.ID = 5000 + B.RowNUM 
FROM TempTable AS A 
INNER JOIN 
(SELECT *, ROW_NUMBER() OVER(order by ID) AS RowNUM FROM TEMPTABLE) AS B 
ON A.ID = B.ID

Answer 4

执行此操作，将获得您想要的结果。

SET @i = 5000;
UPDATE table_name SET ID=(@i:=@i+1);

如何使用UPDATE从SQL中的特定值增加ID列

4 个答案: