create proc pr_YangHui @n int --杨辉三角的层数，1~67 as /* SQL实现显示杨辉三角 */ begin set nocount on if @n<1 or @n>67 return declare @t table(nid int identity(1,1), val bigint) --存储杨辉三角中的数字 insert @t select top 80 1 from sysobjects a, sysobjects b declare @i int, @str varchar(4000), @nWidth int, @cSpace varchar(20) --计算数字的最大宽度,以便控制数字前面显示的空格 set @i=1 while @i<=@n begin update a set val=a.val+b.val from @t a join @t b on a.nid=b.nid+1 where a.nid<@i set @i=@i+1 end select @nWidth = len(max(val))+1 from @t update @t set val=1 where nid<@i select @nWidth = @nWidth + @nWidth%2, @cSpace=space(@nWidth) --打印杨辉三角 set @i=1 while @i<=@n begin update a set val=a.val+b.val from @t a join @t b on a.nid=b.nid+1 where a.nid<@i set @str= '' select @str=@str+right(@cSpace+cast(val as varchar), @nWidth) from @t where nid<=@i print space((@n-@i)*@nWidth/2)+@str set @i=@i+1 end end go exec pr_YangHui 6 /* 1 1 1 1 2 1 1 3 3 1 1 4 6 4 1 1 5 10 10 5 1 */ --drop proc pr_YangHui
本文转自温景良博客园博客，原文链接：http://www.cnblogs.com/wenjl520/archive/2008/11/04/1326633.html，如需转载请自行联系原作者
