--1、随着newid()  go  --创建一个视图(因为不能在功能直接用于newid())  create view vnewid  as  select newid() N'MacoId';  go  --创建函数 create function getrandstr(@n int)  returns varchar(max)  as  begin      declare @i int      set @i=ceiling(@n/32.00)      declare @j int      set @j=0      declare @k varchar(max)      set @k=''      while @j<@i      begin      select @k=@k+replace(cast(MacoId as varchar(36)),'-','') from vnewid      set @j=@j+1      end      set @k=substring(@k,1,@n)  return @k  end     --測试演示样例 select dbo.getrandstr(75)  --执行结果 /*  D185504AD09C4D5796F7016983E67414CEE25162EA9F43D195D43328A4CF01AC7C586521D8E  */     --我们能够发现结果中的字母都是大写的。或是都是小写的。

--换种方法来写下： go --创建函数 create function [dbo].[m_rand](@mycount int) returns nvarchar(2000) as begin declare @maco_wang table (id varchar(1)) declare @maco_number int,@number int; declare @my_one nvarchar(max),@my_two nvarchar(max) set @my_one='';set @maco_number=0; set @number =48; while (@number>=48 and @number<=57) or (@number>=65 and @number<=90) or (@number>=97 and @number<=122) begin insert into @maco_wang select char(@number) set @number=@number+1; if(@number=58) begin set @number=65 end if(@number=91) begin set @number=97 end end while @maco_number<@mycount begin select @my_two=id from @maco_wang order by (select MacoId from dbo.m_macoview); set @my_one=@my_two+@my_one; set @maco_number=@maco_number+1; end return @my_one end --测试用例 select [dbo].[m_rand](75) --的结果 /* 5nN0w4o4VOkjacB5so2uvCuw2ZRrnBhxEi4IcsEOHzBbStKmR1p8ASH4N4XaxhDoDEtkX8bZ0CR */