Calculate total business working days between two dates

Question

select  count(distinct(dateadd(d, 0, datediff(d, 0,checktime)))) as workingdays
from departments,
 dbo.USERINFO INNER JOIN dbo.CHECKINOUT ON 
     dbo.USERINFO.USERID =          


        

Answer 1

following query calculate Fridays count between @FromDate and @ToDate variable

((DATEDIFF(DAY,@FromDate,@ToDate)-(6-DATEPART(dw,@FromDate)))/7)*2

Following query calculate Working day count and business day count between to date :

DECLARE @FromDate DATE = '2014-05-01',
    @ToDate DATE = '2014-05-30'

SELECT  COUNT(DISTINCT CAST(checktime AS Date)) as workingdays,
        DATEDIFF(DAY,@FromDate,@ToDate) -
       ((DATEDIFF(DAY,@FromDate,@ToDate)-(6-DATEPART(dw,@FromDate)))/7)*2 AS BusinessDay
from departments,
 dbo.USERINFO INNER JOIN dbo.CHECKINOUT ON 
     dbo.USERINFO.USERID = dbo.CHECKINOUT.USERID
where  userinfo.name='Gokul Gopalakrishnan' and deptname='GEN/SUP-TBL' 
and checktime>= @FromDate and checktime<=@ToDate