7 select dt, to_number(to_char(dt, 'iw')) wk_of_yr Thanks. Latest Tech Product Launches in AI, Big Data, Cloud and More: Week of June 18, 2020, Load Hard-Coded “NULL” Keyword in a Target Column, Top 5 Programmatic Advertising Platforms for 2020 and Beyond, How to Overcome Hiring Bias to Tap Hidden Talent, Elon Musk Rolls Out Tesla’s Full Self-Driving Beta, Experts Sound Caution, Remote First: Creating Resilient Organizations, What Is an Inclusive Workplace? 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: [In Oracle syntax the format specifier for the U.S. week numbering system is WW, in either upper or lower case.

I got a question to ask regarding date ranges and weeks, months and year between two given dates. Thanks for the question, Silvana. 2 select to_date('01/01/'||to_char(sysdate, 'RRRR'), 'MM/DD/RRRR') + rownum - 1 dt It helped me very much. 6 wk_dt as ( SQL> 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. Answered by: Sergiusz Wolicki - Last updated: March 19, 2018 - 8:12 pm UTC. 8 from date_wk If your question is to get start date & end date ( Monday & Saturday ) for every week which falls within the certain period given, then below is the query for the same.. select TO_char(dt, ‘dd-mon-yyyy’) , TO_char(dt +5 ,’dd-mon-yyyy’) 10 select min(dt) DT WK_OF_YR 6 wk_dt as ( If you can control the NLS territory setting (or even better: you want to adapt to it), then the simplest solution is to use TRUNC(SYSDATE,'D') and TRUNC(SYSDATE,'D')+6 : we have also used the next_day for doing windowing outside of NLS setting. The full definition of U.S. Week Number 1 is: The first week of the year contains 1 January, the 1st Saturday and is comprised of days 1-7 of the year. SQL>, Put Your Oracle Database In the Oracle Cloud, Pseudonymization Of Personal Data With Oracle. 9 ) Defaults to the current date.

13 / The two week numbering systems in use by Oracle are the U.S. week numbering system and the ISO week numbering system. 13 / You can also catch regular content via Connor's blog and Chris's blog. Try This….this is in Sql server 2000……..————-, declare @d datetimedeclare @numbers table (n int), insert into @numbers(n)select 0 union allselect 1 union allselect 2 union allselect 3 union allselect 4 union allselect 5 union allselect 6 union allselect -1 union allselect -2 union allselect -3 union allselect -4 union allselect -5 union allselect -6, select min(d) AS WeekBegin, max(d) AS WeekEndfrom( select dateadd(d, n, @d) as d, datepart(week, dateadd(d, n, @d)) as w from @numbers) twhere datepart(week, @d) = w. SELECT DECODE (trim(TO_CHAR (in_date), ‘day’)), ‘monday’, in_date)+0, ‘tuesday’, in_date) – 1, ‘wednesday’, in_date) – 2, ‘thursday’, in_date) – 3, ‘friday’, in_date) – 4, ‘saturday’,in_date)-5, ‘sunday’,in_date)-6 ) start_day, DECODE (trim(TO_CHAR (in_date), ‘day’)), ‘monday’, in_date)+5, ‘tuesday’, in_date) + 4, ‘wednesday’, in_date) + 3, ‘thursday’, in_date) + 2, ‘friday’, in_date) + 1, ‘saturday’,in_date)+0, ‘sunday’,in_date)+6 ) end_day FROM DUAL. 10 select dt, wk_of_yr But Week 7 of that numbering convention doesn't contain February 8, 2009: Week 6 does, although it's not the starting date of that week: Now, if the ISO week numbering convention is used the first condition of the question won't be satisfied as Week 1 is defined to contain the first Thursday of the calendar year, thus the starting date for ISO Week 1 can be in December, and for 2009 it is: [The Oracle format specifier for the ISO week numbering system is IW, in either upper or lower case. 16-FEB-09 7 8 from date_wk What’s the Future of TikTok If Oracle or Microsoft Buys It?

3 from dual 13-FEB-09 7 5 ), The change to the format specifier is the only change made to the query posted at the beginning.]. 2 select to_date('01/01/'||to_char(sysdate, 'RRRR'), 'MM/DD/RRRR') + rownum - 1 dt By signing up you agree to our Terms of Use and Privacy Policy. The second subquery takes that list and generates the U.S. week number for each date. 11 from wk_dt 3 from dual 12 where wk_of_yr = &&1 The first subquery shown generates a list of dates starting with January 1 of the current year and ends 365 days later. 13 / 12 where wk_of_yr = &&1

09-FEB-09

11 from wk_dt The 4th of JAN 2017 happens to be a wednesday (day 4).

10 select min(dt) 4 connect by level <= 366 Week number 1 in this convention is defined as the week beginning on January 1, which may be a partial week based on the convention that calendar weeks start on Sunday and end on Saturday.

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