FAQ: Window Functions - FIRST_VALUE and LAST_VALUE

This community-built FAQ covers the “FIRST_VALUE and LAST_VALUE” exercise from the lesson “Window Functions”.

Paths and Courses
This exercise can be found in the following Codecademy content:

Analyze Data with SQL

FAQs on the exercise FIRST_VALUE and LAST_VALUE

There are currently no frequently asked questions associated with this exercise – that’s where you come in! You can contribute to this section by offering your own questions, answers, or clarifications on this exercise. Ask or answer a question by clicking reply (reply) below.

If you’ve had an “aha” moment about the concepts, formatting, syntax, or anything else with this exercise, consider sharing those insights! Teaching others and answering their questions is one of the best ways to learn and stay sharp.

Join the Discussion. Help a fellow learner on their journey.

Ask or answer a question about this exercise by clicking reply (reply) below!
You can also find further discussion and get answers to your questions over in #get-help.

Agree with a comment or answer? Like (like) to up-vote the contribution!

Need broader help or resources? Head to #get-help and #community:tips-and-resources. If you are wanting feedback or inspiration for a project, check out #project.

Looking for motivation to keep learning? Join our wider discussions in #community

Learn more about how to use this guide.

Found a bug? Report it online, or post in #community:Codecademy-Bug-Reporting

Have a question about your account or billing? Reach out to our customer support team!

None of the above? Find out where to ask other questions here!

Why doesn’t Last_Value select the largest number (of posts) for the PARTITIONED BY username when the ORDER BY call in the window function sorts the values in ascending order?
In other words: I’m looking for some clarity on why “RANGE BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED FOLLOWING” needs to be used in the window function when using Last_Value.

Hope someone can explain this as well - I really do not understand how that “RANGE BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED FOLLOWING” code functions.