sql 生成随机字符串

 生成三位随机字母+12位数字

declare  @CardCode varchar(50),@str varchar(50), @c int;
select @CardCode=abs(CHECKSUM(NEWID()))
set @c=12-LEN(@CardCode);
select @str= FLOOR(rand()*POWER(10,@c))
set @CardCode=@CardCode+@str

declare   @sql   nvarchar(400) ,@name varchar(50) ;  

 select @name=  char(  cONVERT(NVARCHAR,CONVERT(INT,26*rand())+97) )+    
CHAR(  CONVERT(NVARCHAR,CONVERT(INT,rand()*26)+97) )+    
CHAR(  CONVERT(NVARCHAR,CONVERT(INT,rand()*26)+97) )

  select @name+CAST( @CardCode as nvarchar(50))

下面这个是生成大写字母的

declare   @sql   nvarchar(400) ,@name varchar(50) ;  
 select @name=  char(  cONVERT(NVARCHAR,CONVERT(INT,26*rand())+65) )+    
CHAR(  CONVERT(NVARCHAR,CONVERT(INT,rand()*26)+65) )+    
CHAR(  CONVERT(NVARCHAR,CONVERT(INT,rand()*26)+65) )
select @name