Question

I really need help on this those function DATEDIFF OR DateAdd , because I have no idea on those things.

Declare @EstDate as Date,
        @Shipdate as Date,
        @Workingday as Int,

I need to do like this:

@EstDate(Date) = @ShipDate(DATE) - @WorkingDay(int) - 2days

Example: @EstDate(date) = ‘6/11/2011’ – 5days – 2days.

How can I do this formula in SQL ? >_< In PHP its easy, but in SQL 2000 up, I have no ideas.

Answer 1

I think this will do it. Basically this adds a negative number of days to @ShipDate. The negative number of days will equal @WorkingDay + 2.

I really don’t know what @WorkingDay is supposed to represent. This example assumes it’s just a number that represents something to you.

@EstDate = DateAdd(dd,-(@WorkingDay + 2),@ShipDate) 

It would look something like this, given your example:

@EstDate(date) = DateAdd(dd, -(5 days + 2 days), '6/11/2011')