Sql Server 查询一段日期内的全部礼拜天

 /*
	查询一段日期内的全部礼拜天
	@startdate 開始日期
	@enddate 结束日期
 */

declare @startDate datetime
declare @endDate datetime
declare @week varchar(20)
set @startDate = '20150101'
set @endDate = '20151231'
while @startDate <= @endDate
begin
	set @week = DATENAME(weekday, @startDate);
	if (@week = '星期六' or @week = '星期日')
	begin
		select DATENAME(YEAR, @startDate) as "year", @startDate as "day"
	end

	set @startDate = @startDate + 1;
end