SQL重新排序

DECLARE @id UNIQUEIDENTIFIER

DECLARE myCursor CURSOR
FOR
    SELECT  ProductId
    FROM    ( SELECT    ProductId ,
                        COUNT(1) cou
              FROM      dbo.T_ProductDescription
              GROUP BY  ProductId
              HAVING    COUNT(1) > 1
            ) tmp

OPEN myCursor

FETCH NEXT FROM myCursor INTO @id

WHILE @@FETCH_STATUS = 0
    BEGIN

        UPDATE  l
        SET     l.Sort = num
        FROM    dbo.T_ProductDescription l
                INNER JOIN ( SELECT l.Id ,
                                    ROW_NUMBER() OVER ( ORDER BY l.Sort ASC ) num
                             FROM   dbo.T_ProductDescription l
                             WHERE  l.ProductId = @id
                           ) tmp ON l.Id = tmp.Id
       

        FETCH NEXT FROM myCursor INTO @id
    END
    
CLOSE myCursor
DEALLOCATE     myCursor