sql server取某个时间段内所有日期或者所有月份

declare @begin datetime,@end datetime 
set @begin=‘2015-2-6‘ 
set @end=‘2015-12-2‘ 

declare @months int 
set @months=DATEDIFF(month,@begin,@end) 
select convert(varchar(7),DATEADD(month,number,@begin) ,120) AS 月份 
from master.dbo.spt_values 
where type=‘p‘ AND number<=@months

DECLARE @days INT,  
@date_start DATETIME = ‘2017-03-15‘,  
@date_end DATETIME = ‘2017-04-13‘   
SET @days = DATEDIFF(DAY, @DATE_START, @DATE_END);    

	SELECT convert(char(10), DATEADD(dd, number, @DATE_START),120) AS yyyymmdd  
	FROM    master.dbo.spt_values  as spt
	WHERE   type = ‘p‘  
	AND number <= @days