Week 6 does, although it’s not the starting date of that week: SQL> with date_wk as ( If we use the U.S week numbering system we can easily satisfy the first condition listed in the posted question as Week 2 is defined as the week containing January 1: SQL> with date_wk as (Ģ select to_date('01/01/'||to_char(sysdate, 'RRRR'), 'MM/DD/RRRR') + rownum - 1 dtīut Week 7 of that numbering convention doesn’t contain February 8, 2009: SQL> with date_wk as ( They ARE different in how they define Week number 1 and that can throw a ‘monkey wrench’ into any methodology one could implement to answer the above listed question.
#Oracle sql week number iso#
week numbering system and the ISO week numbering system. The two week numbering systems in use by Oracle are the U.S. Let’s look at both of them and see what differences they contain and how they can throw the listed assumptions ‘out of the window’. Such assumptions depend upon which week numbering ‘scheme’ one elects to use, and there are two common schemes currently in use by Oracle. The concept assumes a number of things which may or may not be true, such as the first day of week 1 is January 1 and that week 7 is defined to include, and also begin on, February 8. That same question popped up just recently so I dug out the example I made in2009 which is still relevant today. If I pass week number as 7 then it should return
A long while back someone asked the following question, which seems simple enough: Is there a quick way to convert week number (of the year) to start date of that week?ĮX: If I pass week number as 1 then it should return
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