生成纯字母随机编号的示例(仅大小或者小写).sql

--取得随机数的视图
CREATE VIEW v_RAND
AS
SELECT re=STUFF(RAND(),1,2,'')
GO

--生成随机编号的函数
CREATE FUNCTION f_RANDBH(@BHLen int)
RETURNS varchar(50)
AS
BEGIN
 DECLARE @r varchar(50)
 IF NOT(ISNULL(@BHLen,0) BETWEEN 1 AND 50)
  SET @BHLen=10

 SELECT @r=CHAR(65
   +(SUBSTRING(re,1,1)
   +SUBSTRING(re,2,1)
   +SUBSTRING(re,3,1))%26)
  +CHAR(65
   +(SUBSTRING(re,4,1)
   +SUBSTRING(re,5,1)
   +SUBSTRING(re,6,1))%26)
 FROM v_RAND
 WHILE LEN(@r)<@BHLen
  SELECT @r=@r+CHAR(65
    +(SUBSTRING(re,1,1)
    +SUBSTRING(re,2,1)
    +SUBSTRING(re,3,1))%26)
   +CHAR(65
    +(SUBSTRING(re,4,1)
    +SUBSTRING(re,5,1)
    +SUBSTRING(re,6,1))%26)
  FROM v_RAND
 RETURN(LEFT(@r,@BHLen))
END
GO

--调用
SELECT dbo.f_RANDBH(6),dbo.f_RANDBH(8)
--结果: UJXIJD  PAPGTQUX