sql 随机数系列

一、把数据库把某个字段更新为随机数

DECLARE @Hour INT
DECLARE @Counts INT
SET @Hour =DATENAME(HOUR, GETDATE())
IF (@Hour>=0 AND @Hour<7)
BEGIN
SET @Counts=ROUND((2 * RAND() + 1), 0)
END
ELSE IF (@Hour>=7 AND @Hour<8)
BEGIN
SET @Counts=ROUND((4 * RAND() + 4), 0)
END
ELSE IF (@Hour>=8 AND @Hour<11)
BEGIN
SET @Counts=ROUND((9 * RAND() + 19), 0)
END
ELSE IF (@Hour>=11 AND @Hour<13)
BEGIN
SET @Counts=ROUND((9 * RAND() + 9), 0)
END
ELSE IF (@Hour>=13 AND @Hour<=17)
BEGIN
SET @Counts=ROUND((9 * RAND() + 19), 0)
END
ELSE IF (@Hour>=18 AND @Hour<21)
BEGIN
SET @Counts=ROUND((9 * RAND() + 9), 0)
END
ELSE IF (@Hour>=21 AND @Hour<24)
BEGIN
SET @Counts=ROUND((4 * RAND() + 4), 0)
END
UPDATE dbo.t_Config SET Value=Value+@Counts

2、自定义随机函数

CREATE FUNCTION RoundNum(@Lower INT,@Upper INT)
RETURNS INT
AS
BEGIN
DECLARE @Result INT
SELECT @Result = ROUND(((@Upper - @Lower -1) * RAND() + @Lower), 0)
RETURN( @Result)
END
GO