Calculate Week Ending date in Oracle SQL where the week start is the previous SAT to the current FRI

Question

I have a transaction date in my table that I would like to calculate a Week Ending date for

The problem is the weeks for us go from Saturday to Friday, don't ask me why,

So for example this week, today is 10/5/2020, the week end date should be 10/09/2020

and this Saturday, 10/10/2020, would be week ending date 10/16/2020.

Anyone know how to properly achieve this?

Answer 1

You could use next_day() :

select t.*,
    case when to_char(mydate, 'FMDAY') = 'FRIDAY' 
        then mydate
        else next_day(mydate, 'FRIDAY')
    end as endofweek
from mytable t

Note that both to_char(..., 'DAY') and next_day() are dependant on the language of your session. If your database or session are not in English language, you need to adujst the literal strings.