T-SQL查询两个日期之间的休息日（周六周日）天数

SELECT COUNT(*) 
FROM MASTER..SPT_VALUES
WHERE TYPE = 'P'
AND DATEADD(DAY,NUMBER,'2014-03-13')<='2014-03-26'
AND DATEPART(WEEKDAY,DATEADD(DAY,NUMBER,'2014-03-13')) IN (6,7)