Oracle PL/SQL: GROUP BY

I recently wrote, HERE, how I regularly see commonly asked questions appearing in forums relating to the same topic. Like with SELECT INTO from my previous posts, I also see lots of questions about the correct usage of the GROUP BY clause and so I figured that I would write up an explanation of how to properly use this and then, again, I can reference this post's URL in response to questions on this topic!

Oracle PL/SQL: SELECT INTO

Like many in the Oracle community, I occasionally find myself looking through forums and helping out where I can. I consistently see some basic questions cropping up in forums like StackOverflow, often the same question over and over again - one of which is regarding the "SELECT INTO" statement. I have found myself writing responses to questions about SELECT INTO statements many times and so I figured that I would write up an explanation of how to properly use this and then I can reference this post's URL in response to questions on this topic! Side note: It's been quite some time that I used PL/SQL and really enjoyed spinning up an oracle database in my free tier account and writing this post - perhaps expect a few more similar style posts alongside my usual content (maybe more commonly asked forum topics)