逐条更新数据 sql

declare @tid int       

declare @fid int

declare @i int

declare @j int

set @j=(select count(*) from tbl1.dbo.dnt_topics)

set @i=1        

while   @i<@j        

begin            

    set @tid = (select tid from ( select ROW_NUMBER() over (order by tid asc ) as Row, tid,fid from dnt_topics ) as sp  where
Row=@i)

    set @fid=(select fid from ( select ROW_NUMBER() over (order by tid asc ) as Row, tid,,fid from dnt_topics ) as sp  where
Row=@i)                

    update            

        tbl2.dbo.dnt_topics         

    set                 

        fid=@fid        

    where             

        tid=@tid                    


        set @i=@i+1        

end