CREATE FUNCTION getweekdayCount ( @month varchar(10))

RETURNS INT

AS

BEGIN

--declare @month varchar(10)

--set @month='201802'

---通过月份得到本月有几天周末

DECLARE @DAYCOUNT int

DECLARE @datestart datetime

DECLARE @dateend datetime

set @datestart =cast(SUBSTRING( @month,0,5)+'-'+SUBSTRING( @month,5,2)+'-01' as datetime)

set @dateend=dateadd(ms,-3,DATEADD(mm, DATEDIFF(m,0,@datestart)+1, 0))

SET @DAYCOUNT=0

while @datestart<=@dateend

begin

if(datename(weekday,@datestart)= '星期日' or datename(weekday,@datestart)='星期六') begin

set @DAYCOUNT=@DAYCOUNT+1

end

SET @DATESTART=DATEADD(DAY,1,@DATESTART)

end

RETURN(@DAYCOUNT)

END