Get past 90 days and business days only

How can I get the past 90 days that includes business days only?
select *from mytable where shippeddate >= DATEADD(DD,-90,getdate()) and shippeddate < getdate()
VBdotnet2005Asked:
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Phillip BurtonDirector, Practice Manager and Computing ConsultantCommented:
What do you count as a business day? It varies all over the world.

Maybe you have a table with all of the exceptions, and you omit those, plus standard non-business days (which in your part of the world may be Saturday and Sunday, or may be Friday and Saturday).

XLeratorDB have got a set of CLR functions which may be useful - see this as a review: http://blog.sqlauthority.com/2013/12/10/sql-server-working-with-business-days-in-sql-server-a-different-approach/
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Brian CroweDatabase AdministratorCommented:
Assuming you only want Monday thru Friday you could try...

SELECT *
FROM mytable 
WHERE shippeddate >= DATEADD(DD,-90,getdate())
   AND shippeddate < getdate()
   AND DATEPART(WEEKDAY, shippeddate) IN (2, 3, 4 5, 6)

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Scott PletcherSenior DBACommented:
If you count only weekends, then you can simply go back an additional 26 days (90 days = 13 weeks = 26 weekend days), and exclude week-end days from the result.

where shippeddate >= DATEADD(DD,-90-26,getdate()) and shippeddate < getdate() and datediff(day, 0, shippeddate) % 7 in (5, 6)
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PortletPaulfreelancerCommented:
or, you can create and maintain a calendar table which permits not only tracking business days in the cyclical sense but records public holidays as well. There are many methods for doing this. Even if you record even a decade of dates in a table you are only dealing with ~3653  records (depending on the leaps years).

Here's an article on the subject

& the calendar table can be used in all sorts of ways when reporting/analysing data, not just helpful for calculating working days.
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Scott PletcherSenior DBACommented:
Be aware that the return values from "DATEPART(WEEKDAY, " can vary based on SQL settings, whereas "datediff(day, 0, shippeddate) % 7" returns the same value for any/all SQL settings.
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