only working days on case in Oracle SQL - sql

Question

I've executed the following case in a query:
WHEN phases is null and INSERTIONDATE is null and Priority = 1 and Complexity = 'minor' THEN trunc(CreationDate)+2
But I want to add +2 working days. How can I achieve that?
Example:
Lets say that we have an ID with insertion date NULL and priority 1 minor and creation date on Friday 15/01/2016.
The output should be:
115 prio1 minor acknowledge_date 19/01/2016

Answer 1

This is a total shot in the dark, but you mentioned you wanted to add two work days, and the example you gave (January 16 + 2 work days = January 19) tells me you mean you want to skip weekends. If this is the case, I think something like this might work:
select
case
when phases is null and
insertiondate is null and
priority = 1 and
complexity = 'minor' then
case to_char(creationdate, 'D')
when '5' then to_char(creationdate + 4, 'DD/MM/YYYY')
when '6' then to_char(creationdate + 4, 'DD/MM/YYYY')
when '7' then to_char(creationdate + 3, 'DD/MM/YYYY')
else to_char(creationdate + 2, 'DD/MM/YYYY')
end
end
from test
In essence, I'm doing a poor man's, brute-force business day calculation of "2 work days" by saying on Thursday and Friday, 2 business days = 4 calendar days, on Saturday, 2 business days = 3 calendar days, and all other days 2 days = 2 days.
It wouldn't shock me if this misses the mark, but maybe it's a starting point for clarification.
For the following create days, it returns the following results:
Creation date Result
1/15/2016 9:28:31 AM 19/01/2016
1/16/2016 9:41:49 AM 19/01/2016
1/17/2016 9:41:51 AM 19/01/2016
1/18/2016 9:41:52 AM 20/01/2016
1/19/2016 9:41:54 AM 21/01/2016
1/21/2016 9:42:00 AM 25/01/2016