Transact-SQL不使用游标的两个循环方法

  • 来源: 天新网 作者: 若水   2008-05-10/18:30
  •   TSQL不用游标就可以循环的两个方法
    方法一:
    SELECT * INTO #t1 FROM dbo.HorseBase
    DECLARE @id int
    DECLARE @t2 table (id int)
    WHILE (exists(SELECT HorseNumber FROM #t1))
    BEGIN
    SELECT TOP 1 @id=HorseNumber FROM #t1
    INSERT INTO @t2 SELECT HorseNumber FROM #t1 WHERE HorseNumber=@id
    DELETE FROM #t1 WHERE HorseNumber=@id
    END
    DROP Table #t1
    方法二:
    DECLARE @r int
    DECLARE @number int;
    DECLARE @t2 table ( [name] nvarchar(200))
    SELECT ROW_NUMBER() OVER (ORDER BY [Name] ) AS number,[name] INTO #nn1 FROM dbo.tbl_Entity
    SELECT @number=MAX(number) FROM #nn1
    SET @r=1
    WHILE (@r<=@number)
    BEGIN
    INSERT INTO @t2 SELECT [name] FROM #nn1 WHERE number=@r
    SET @r=@r+1
    END
    DROP TABLE #nn1
    注:ROW_NUMBER() 在分页存储过程中也是比较好用的。

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