Count Business Days

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Count Business Days

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megan.beebe

Posted Friday, July 11, 2008 9:55 AM

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Comments posted to this topic are about the item Count Business Days

Post #532609

The Dixie Flatline

Posted Friday, July 18, 2008 8:14 AM

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If you prepopulate a "calendar" table with your weekend days and holidays, you can also do a simple query as shown in the following example. Please note that the great majority of the code which follows is actually the code used to populate a table variable which on our system is a permanent table . All the work of calculating business days is done in the last three lines. (The tally table is simply a table of numbers [N] from one to a million which I always create in any db. )

Having a calendar table also lets you do some cute things such as having a column that designates whether the holiday is for U.S., Canada, or both, which lets your function take a parameter to pass to your where clause to pick the appropriate holidays. You might also want an option to NOT include Saturdays as business days, or to add 1 to the datediff. Different clients count turn times in different ways.

-----------------------------------------------------------------------------------------------------------------
-- example
-----------------------------------------------------------------------------------------------------------------

declare @start datetime
declare @end datetime
declare @weekends_holidays table (offday datetime primary key, weekday int)

select @start = '7/1/2008',@end = '7/10/2008'

-- the following query populates the table variable with some weekend days and the 4th of July
insert into @weekends_holidays
select distinct @start+N-1,datepart(dw,@start+N-1)
from tally
where N <= datediff(dd,@start,@end)
and datepart(dw,@start+N-1) in (1,7) -- living for the weekend
union all
select '7/4/2008',datepart(dw,'7/4/2008') -- three cheers for the red, white, and blue

select * from @weekends_holidays

-------------------------------------------------------------------------
-- all of the above was just to set up the following query
-- in practice, @weekends_holidays would be a permanent table
-------------------------------------------------------------------------

select datediff(dd,@start,@end) - count(*) as businessDays
from @weekends_holidays
where offday between @start and @end

__________________________________________________

Against stupidity the gods themselves contend in vain. -- Friedrich Schiller
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Post #536827

bitbucket-25253

Posted Friday, July 18, 2008 10:55 AM

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Created the function using copy / paste / execute - no reported error then tested using the following:

DECLARE @Bdays AS INT
SET @Bdays = dbo.fn_GetBusinessDays('07/06/2008','07/27/2008')
SELECT @Bdays
Result returned 14 ..
Now counting on my fingers it is actually 15 days

If everything seems to be going well, you have obviously overlooked something.

Ron

Please help us, help you -before posting a question please read
Before posting a performance problem please read

Post #536950

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