How to get Previous business day in a week with that of current Business Day using sql server

Question

i have an ssis Package which runs on business days (mon-Fri). if i receive file on tuesday , background(DB), it takes previous business day date and does some transactions.

Answer 1

Then how about:

declare @dt datetime='1 dec 2012'

select case when 8-@@DATEFIRST=DATEPART(dw,@dt)  
            then DATEADD(d,-2,@dt)  
        when (9-@@DATEFIRST)%7=DATEPART(dw,@dt)%7  
            then DATEADD(d,-3,@dt)  
        else DATEADD(d,-1,@dt)  
    end