根據一定原則自動生成序列號的具體示例

需求： ◆1、生産收貨時，在數量處按CTRL+TAB，在序列號錄入處按ShiFT+F2,能自動生成序列號； ◆2、生成原則如下：0703MG51T-09-S05-1200#001，其中0703爲年月代碼，MG51T-09-S05-1200爲物料號，#號爲分隔符，001爲本月第一筆收貨，以後自動加1。 我的語句如下： declare @t1 as varchar(32) declare @t2 as varchar(32) declare @itemcode as varchar(20) declare @y as varchar(20) declare @m as varchar(20) declare @ml as integer declare @qty1 as varchar(3) declare @maxid as varchar(3) declare @tid as varchar(3) select @itemcode=rtrim($[$43.5.0]) select @y=substring(cast(year(getdate()) as varchar),3,2) select @m=cast(month(getdate()) as varchar) select @ml=len(Rtrim(@m)) if @ml=1 select @m='0'+@m else select @m=@m select @t1=Ltrim(@y+@m+@itemcode) select @qty1=isnull(count(*),0) from OSRI where [url=mailto:ItemCode=@itemcode]ItemCode=@itemcode[/url] and substring(IntrSerial,1,4)=@y+@m if Rtrim(@qty1)='0' begin select @tid='001' end else begin select @maxid=cast(isnull(max(cast(substring(IntrSerial,len(Rtrim(IntrSerial))-2,3) as float)),0) as float)+1 from OSRI where ItemCode=Rtrim(@itemcode) and substring(IntrSerial,1,4)=@y+@m if len(Rtrim(@maxid))=0 begin select @tid='001' end if len(Rtrim(@maxid))=1 begin select @tid='00'+cast(Rtrim(@maxid) as char(1)) end if len(Rtrim(@maxid))=2 begin select @tid='0'+cast(Rtrim(@maxid) as char(2)) end if len(Rtrim(@maxid))=3 begin select @tid=cast(Rtrim(@maxid) as char(3)) end end select @t2=@t1+'#'+@tid select @t2