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Free SQL Course of the Month – Window Functions in PostgreSQL

Are you looking for the best way to master SQL window functions? In this article, I'll show you how you can do so for free. Throughout January 2023, you can access the interactive course Window Functions in PostgreSQL for free. Hurry, time is running out!

Need a free PostgreSQL course on window functions? You've come to the right place!

If you are reading this article, you probably know PostgreSQL is one of the most popular databases in the world. I must also admit that it is my favorite RDBMS. I love it for its functionality, speed, and smooth integrations with other tools. In addition, it is open-source, supported by a global community that is constantly expanding its features.

If you need a good relational database solution for your project, PostgreSQL is a great choice. If you are not familiar with it, check out this article on the history of PostgreSQL. Also, check out "Is Learning PostgreSQL in 2022 Worthwhile?"

If you are just at the beginning of your journey and need to learn the basics of PostgreSQL first, start with the SQL Basics in PostgreSQL course. There, you find everything you need to start analyzing your data and writing your first SQL queries. It is a set of 130 interactive exercises that should not take you more than 10 hours to complete. Once you've done that, come back here for more.

Window Functions in PostgreSQL

How do you get this free PostgreSQL course?

  1. Create a free account or log in if you already have one.
  2. Start the course.

What Are Window Functions in PostgreSQL?

Window functions are relatively new considering SQL is more than 50 years old. They arm you with great capabilities and significantly elevate the level of your analytical skills.

Window functions let you compute complicated statistics in one simple query. Need to rank the most popular products in your online store? Want to analyze time series or calculate running totals, averages, etc.? SQL Window functions to the rescue! While they are most often used in the world of finance, sales and marketing have plenty of use cases as well.

Still not convinced you should learn window functions? Check out this article by Marija titled "Why Should I Learn SQL Window Functions?" For more on this topic, go to Tihomir’s article "What Are Window Functions in SQL?"

What Will You Learn in This SQL Course?

Our awesome interactive PostgreSQL course consists of 218 interactive exercises you can do at your own pace, from anywhere, and at any time. Completing all of them takes about 20 hours. Remember to take your time, give yourself a chance to organize everything in your head, and test the acquired knowledge in practice.

There is also a lot of material in our blog to help SQL learners achieve their goals. To avoid common mistakes and errors, check out these articles:

The Window Functions in PostgreSQL online course is divided into ten parts:

  1. Introduction – Here, you learn what window functions are all about. If at any point you feel it's too difficult, try our SQL Basics in PostgreSQL course first.
  2. OVER() – Here, you take your first major step into the world of window functions with the OVER()
  3. OVER(PARTITION BY) – Discover how to define windows with PARTITION BY. It works much like GROUP BY in that it partitions the rows into groups based on the columns in the PARTITION BY However, unlike GROUP BY, it does not collapse rows.
  4. Ranking Functions – Find out how to rank rows with greater ease using window functions.
  5. Window Frame – Understand how to create sophisticated window frames for your window functions.
  6. Analytics functions – Learn the most essential analytic functions like LEAD and LAG.
  7. PARTITION BY ORDER BY – Generate advanced statistics computed independently for various groups of rows.
  8. Window functions - evaluation order – Do you know when window functions are evaluated in a PostgreSQL query? Let's find out.
  9. Practice field – Master all the skills you have acquired in our extensive practice section. We are big supporters of the learning-by-doing approach, so we believe you should work on writing SQL queries as much as possible. Spend more time on this section.
  10. Final Quiz – Test the skills you have acquired throughout the course with this final quiz.

We create our SQL courses to provide the most positive user experience. Our platform is user-friendly and intuitive. All our online SQL courses, including the one you are just reading about, are interactive. We do not include fashionable video clips and other materials that distract you from learning. We focus on simplicity and usability. Nothing superfluous, just everything necessary.

Window Functions in PostgreSQL

Thanks to our online console, you write live SQL queries and see the results right away. Hands-on exercises based on real-life scenarios provide you with realistic opportunities for you to learn how to write queries with window functions. You can't find a better way to learn! We share our passion with you and give you a full learning experience. All you need is a browser and your enthusiasm to learn SQL.

Many users write to us saying they love our way of learning SQL. We've helped them grow professionally. Our courses are used by major organizations in their employee onboarding processes; you may be interested in how we have helped thousands of Uber employees.

All popular database engines, including Oracle, Microsoft SQL Server, and PostgreSQL, support SQL window functions. MySQL supports window functions in version 8.0 or later. Many Big Data technologies, such as Presto and Hive, also support window functions. So, there is little risk your new knowledge goes to waste in your projects!

Do you want to learn even more about PostgreSQL? This SQL course is part of our track "SQL from A to Z in PostgreSQL." There, you find all the PostgreSQL courses you need to become a PostgreSQL expert. Check it out!

Who Should Take This Course?

Everyone who deals with data analysis daily needs to know window functions. This course, which is free in January, is best suited for that.

Want to advance your querying skills and take your PostgreSQL chops to the next level? Are you a developer needing a refresher on what you already know? This interactive Window Functions in PostgreSQL course gives you valuable skills and the opportunity to practice them in interesting and demanding tasks.

Our SQL course is also useful for students in computer science, finance, and marketing. If you are a student, check out our special educational offer. And let your teachers know about it, too – they may want to use it in their classes.

Window Functions in PostgreSQL

After completing this online SQL course, you receive a PDF certificate. You can publish it on your LinkedIn profile. Check out how easy it is to do so in our short guide.

Free SQL Course for January: Window Functions in PostgreSQL

Now that you have read this article, you know how important it is for you to learn and use SQL window functions. Knowing advanced PostgreSQL topics gives you an edge in the job market, with a chance for a better job and a bigger paycheck. And we have just the right PostgreSQL courses for you.

Want to go even further? If you've completed our free interactive SQL course of the month, Window Functions in PostgreSQL, and need even more hands-on exercises, here is the SQL Practice – January 2023 course.

With this SQL course, you can practice writing SQL queries on a real example. You can play the role of an SQL expert whose task is to help a hotel owner manage her business. Create reports and rankings, calculate a running sum of the total revenue, and much more! is the best platform for learning SQL. We are SQL users ourselves, and we know what is most important when it comes to SQL. We were also all learners once, and we know from our own experience how to learn it well.

Start our Free Course of the Month today!