Informix SQL Calculate WeekNumber

How can I calculate a weeknumber in Informix?

I just need a quick and easy solution that can be easily included in a SQL Select Statement. The 53rd week is not a problem for my intended usage.
Ryan SimmonsBusiness Analyst IIIAsked:
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

x
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

bcnagelCommented:
Hi Ryan.

Here's a function that I like (and that is referenced in an IBM tech article):

CREATE FUNCTION week_of_year(dt date)
RETURNS integer
WITH(NOT VARIANT)

DEFINE day1 date;
DEFINE nbdays int;

LET day1 = MDY(1, 1, YEAR(dt));
LET nbdays = dt - day1;

RETURN 1 + (nbdays + WEEKDAY(day1)) / 7;

END FUNCTION;

Open in new window


The "Date Processing in Informix" article that it is part of should be available here: http://www.ibm.com/developerworks/data/library/techarticle/dm-0510roy/

Take note of the caveats and additional information that is available after the function definition--there's some important (and good) stuff in there.

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Databases

From novice to tech pro — start learning today.