How to get the week of the year in American Standard

Hello

I know that it might be a repetitive question, but has not found a convincing solution to him in any of the previous threads. I'm looking for a function (user defined, if someone has already written it) go the week of the year, American Standard. i.e., The week should begin on Sunday and end on Saturday (and NOT from Monday to Sunday)

03/01/2010 - should be the beginning of the 1st week of 2010... 10/01/2010 will be the beginning of the second week and so on
04/01/2009 - should be the beginning of the 1st week of 2009... 11/01/2009 will be the beginning of the second week and so on.

Does anyone have a function that takes a date as input and returns back the week of the year in the above format? Any help is greatly appreciated.

Thank you

You can add a day to your date in order to manipulate the weeks;

with t as (
   select to_date('02/01/2010','dd/mm/yyyy') dt from dual union all
   select to_date('03/01/2010','dd/mm/yyyy') from dual union all
   select to_date('09/01/2010','dd/mm/yyyy') from dual union all
   select to_date('10/01/2010','dd/mm/yyyy') from dual)
select dt, to_char(dt, 'Day') dy, to_char(dt+1, 'iw') wk
from t;

DT          DY        WK
----------- --------- --
02/01/2010  Saturday  53
03/01/2010  Sunday    01
09/01/2010  Saturday  01
10/01/2010  Sunday    02

Tags: Database

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