How to Get All Sundays of a Month in Oracle SQL Using NEXT_DAY Function

Learn how to retrieve all Sundays in a specific month using Oracle SQL with the NEXT_DAY function and CONNECT BY clause.

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To get all Sundays of a month in Oracle, you can use the `NEXT_DAY` function combined with a `CONNECT BY` clause. Start by selecting the first Sunday of the month using `NEXT_DAY(TRUNC(TO_DATE('YYYY-MM','YYYY-MM')-1),'SUNDAY')` and then increment by one week in a loop. For example: `SELECT NEXT_DAY(TRUNC(TO_DATE('2023-03','YYYY-MM')-1), 'SUNDAY') + (LEVEL - 1) 7 AS sunday FROM dual CONNECT BY LEVEL <= 5 AND TO_CHAR(NEXT_DAY(TRUNC(TO_DATE('2023-03','YYYY-MM')-1), 'SUNDAY') + (LEVEL - 1) 7, 'MM') = '03'`. Replace `'2023-03'` with your target month and year.

FAQs & Answers

  1. How do I find all Sundays in a given month using Oracle SQL? You can use the NEXT_DAY function combined with CONNECT BY to generate all Sundays of a month. Start with the first Sunday using NEXT_DAY(TRUNC(TO_DATE('YYYY-MM','YYYY-MM') -1), 'SUNDAY') and iterate weekly using LEVEL.
  2. What does the CONNECT BY clause do in Oracle SQL queries? CONNECT BY is used for hierarchical queries in Oracle SQL. In this context, it allows looping over rows to generate dates incremented by a weekly interval.
  3. Can this method be adapted to find other weekdays in Oracle? Yes, by replacing 'SUNDAY' with any day of the week (e.g., 'MONDAY', 'FRIDAY') in the NEXT_DAY function, you can list all occurrences of that weekday within a month.
  4. How do I change the month and year in the query? Replace the 'YYYY-MM' string in TO_DATE('YYYY-MM','YYYY-MM') with your target year and month, such as '2023-03' for March 2023.

Watch More

For more SQL date manipulation techniques, check out our tutorials on finding all weekends in a month, filtering dates by weekday, and using date functions across different SQL databases.

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