DateDiff to show working days

Question

Hello
I have set up a calculated field in a report to show the number of days between a job start and end date. I am using T-SQL:
=DateDiff("D", fields!jobstartdate.value, fields!jobenddate.value)
This works fine, but is of course including weekends in its calculation. Is there a way, using datediff, I can include working days only?
Any insight appreciated - thanks.

Answer 1

with tmp(plant_date,d) as
   select cast('20150201' as datetime),datename(weekday,cast('20150201' as datetime))
   union all
   select plant_date + 1,datename(weekday,plant_date+1)
     from tmp
    where plant_date < '20150228'
select* into calendar
  from  tmp
option (maxrecursion 0)
create table #t (dt_from date, dt_to date)
insert into #t values ('20150201','20150209') ---6 working days
insert into #t values ('20150202','20150205') ---4 working day
-- Compute weekday; assume Monday as the first day of week
SELECT dt_from,dt_to,count(plant_date)
FROM #t join calendar on plant_date between dt_from and dt_to
where d not in ('Saturday','Sunday')
group by dt_from,dt_to
Best Regards,Uri Dimant SQL Server MVP,
http://sqlblog.com/blogs/uri_dimant/
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