SELECT IDENTITY(int) NewID ,.. INTO #tmp FROM YouTable

INSERT INTO @tmpTable
SELECT ..., NewID=(SELECT COUNT(*) FROM YouTable b WHERE b.aid<=a.aid) FROM YouTable a

DECLARE @i INT,@cnt INT
SET @i=1
SELECT @cnt=COUNT(*) FROM YourTable
WHILE @i<@cnt
     BEGIN
           SELECT .... FROM #tmp(或@tmpTable依上面情况不同) WHERE NewID=@i
           ...
           SET @i=@i+1
     END

DROP TABLE...