How to find the first and last day of a month with Oracle SQL Date Functions – Medium cross post

I recently wrote a blog post on porting over Oracle SQL to comparable MySQL queries with the purpose of counting specific weekdays occurrences in a given month. That post was inspired by this YouTube video (which I highly recommend). I published a post over on Medium about some of the Oracle Date functions available for these types of queries as I learn more Oracle SQL and wanted to share it with readers here who may be interested…

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In order to count pretty much anything in a month, you need to know how many days there are in the month. With the first and last day of the month values, you can subtract one from the other and find out the number of days.

Oracle SQL has many powerful DATE functions available for a wide range of calculations. In the post, How to find the first and last day of a month using Oracle SQL Date Functions , I use varying combinations of 4 different DATE functions to determine the first and last day of a given month. As an added bonus, I also explore both the previous and following months first and last day values relative to the current month.


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Josh Otwell has a passion to study and grow as a SQL Developer and blogger. Other favorite activities find him with his nose buried in a good book, article, or the Linux command line. Among those, he shares a love of tabletop RPG games, reading fantasy novels, and spending time with his wife and two daughters.

Disclaimer: The examples presented in this post are hypothetical ideas of how to achieve similar types of results. They are not the utmost best solution(s). The majority, if not all, of the examples provided, is performed on a personal development/learning workstation-environment and should not be considered production quality or ready. Your particular goals and needs may vary. Use those practices that best benefit your needs and goals. Opinions are my own.

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