适用多条单据,每个单据多条明细,要对每个单据的明细,进行业务处理。循环数据,识别出每个单据的第一条明细。
--create table ABC--(-- A int,-- B int,-- C int--)--insert ABC select '1','20',null--insert ABC select '1','10',null--insert ABC select '2','15',null--insert ABC select '2','5',nullif exists(select * from sysobjects where id=object_id(N'tempdb..#ttt') ) drop table #ttt DECLARE @sid INT,@sno INT,@preid int,@curid int,@ccid int,@ctotal intselect IDENTITY(int,1,1) as fid,* into #ttt from ABC order by A asc, B descSET @sno=@@rowcountSET @sid=1set @preid=0set @ctotal=0WHILE @sid<=@snoBEGINselect @curid=A from #ttt where fid=@sidselect @ccid=B from #ttt where fid=@sidif @preid<>@curidbeginset @ctotal=@ccidset @preid=@curidendelsebeginset @ctotal=@ctotal-@ccidendupdate #ttt set c=@ctotal where fid=@sidSET @sid=@sid+1ENDselect * from #tttdrop table #ttt
fid | A | B | C |
1 | 1 | 20 | 20 |
2 | 1 | 10 | 10 |
3 | 2 | 15 | 15 |
4 | 2 | 5 | 10 |