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SQL Course of the Month – Window Functions in PostgreSQL

This is what distinguishes ordinary SQL users from professionals – SQL window functions! Would you like to practice them in PostgreSQL, on one of the best interactive SQL courses in the world, and pay nothing for it? Throughout November, you have access to the Window Functions in PostgreSQL course for FREE. You read it right: you won't pay a penny!

What's the catch? Why would someone give you a free course? Well ... We've been doing this for quite some time now, and we make our courses available for free. We like our users, and we want to support their development.

This time, we give you an opportunity to tackle a more advanced topic in SQL. You risk nothing, and you can gain a lot. Get the knowledge and the skills to use SQL window functions in practice.

How can you get this course for FREE in November 2021?

  • Create a free account or log in if you already have one.
  • Start the course. You will have free access to its content until the end of November.

If you want to avoid the mistakes often made by online learners, read Kamila's great article, “5 Reasons You Might Fail to Learn SQL.”

Window Functions in PostgreSQL

What Are SQL Window Functions?

Window functions are an advanced SQL topic. If you are thinking about becoming a professional SQL developer or data engineer, you should be able to use them comfortably.

They are fairly new to the SQL world. Thanks to window functions, you can perform calculations across a set of table rows.

They help create various types of reports and summaries. Do you need to prepare a ranking, get running totals, or calculate moving averages? Or maybe you need to analyze a time series in your project? No problem with window functions! A while ago, Tihomir wrote a great article, “When Do I Use SQL Window Functions?” – you should read it.

If you need specific examples of practical uses for SQL window functions, check out the article Ignacio wrote, “SQL Window Function Example With Explanations.” It is very important you learn window functions and know how to use them in practice. Do you want to know why? My colleague Zahin explains in his article.

Still not sure where your new skills might come in handy? See how SQL window functions can help managers decide who gets a raise. If you know them, there may be a big chance that it will be you!

What Will You Learn in This Course?

Window Functions in PostgreSQL

By doing our course, you learn step by step the power of the window functions in PostgreSQL. Since window functions entered the SQL standard quite recently, many online courses do not yet cover this topic at all; others do so only briefly. This is one of the unique interactive courses dedicated to SQL window functions. What will you find inside?

You'll discover how window functions can be used to:

  • Compute running totals and running averages.
  • Build rankings.
  • Find the best and the worst performers.
  • Investigate trends across time.
  • Calculate contributions to the whole, such as commission percentages.

You'll also get a deeper understanding of the PostgreSQL aggregate functions.

What you learn here gives you a significant advantage in the labor market. Good analysts are wanted by employers, and really good analysts use SQL and window functions at work.

Moreover, the fact that you will learn window functions in PostgreSQL is not a limitation. You can successfully apply your knowledge and new skills in other popular databases such as Oracle or MS SQL Server. Many Big Data technologies, such as Presto and Hive, also support window functions. There are many possibilities for using window functions.

Why Choose the Window Functions Course at

Window Functions in PostgreSQL

To master window functions, you need to practice. You only get it by writing real SQL queries. In this course, you will find over 200 interactive exercises.

You don't need to install or configure anything on your computer. All you need is internet access and your favorite browser. We'll take care of the rest.

Many people try to learn window functions from YouTube. If this is something for you, we will keep our fingers crossed for you. Most of the published tutorials are lengthy and boring lectures. It's hard to find a good one. So, an interactive online course seems like a much better idea.

We created this course with data analysts in mind. Do you deal with finance, business, intelligence, or marketing? Understanding window functions will definitely be useful to you.

For more information, see Tihomir's article, “Who Should Learn SQL Window Function?

Window Functions: Don't Stop Here!

If you are serious about a career in PostgreSQL data analytics, consider doing the SQL from A to Z in PostgreSQL track. You will find everything you need for working with relational databases.

You can go "all in'' and buy the All Forever Plan right away. You get access to all courses on our platform, including those that will be published in the future. Pretty sweet offer!

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