sql中循环处理当前行数据和上一行数据相加减

--drop table #temptablecreate table #temptable(  argument1 int,  argument2 int,  argument3 datetime)declare @rowcount int,@argument1 int,@argument2 nvarchar(50),@argument3 datetimeset @rowcount=1set @argument1=1set @argument2=0set @argument3=GETDATE()while(@rowcount<100)begin  insert into #temptable(argument1,argument2,argument3)        values(@argument1,@argument2,@argument3)    set @argument1=@argument1 + datepart(day,@argument3)  set @argument3=@argument3-1    set @rowcount = @rowcount + 1end--select * from #temptabledeclare @lastargument2 intset @lastargument2=0set @argument2=0declare _cursor cursor for(select argument1 from #temptable)open _cursor;fetch next from _cursor into @argument2 while @@fetch_status = 0begin        update #temptable  set argument2=@argument2+@lastargument2  where current of _cursor    set @lastargument2=@argument2    fetch next from _cursor into @argument2 endclose _cursordeallocate _cursor--select * from #temptable