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()
select *from mytable where shippeddate >= DATEADD(DD,-90,getdate()) and shippeddate < getdate()
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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.
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/