Articles Cookbook
18 Apr 2023
Tihomir Babic

10 Beginner SQL Practice Exercises With Solutions

Solve these ten SQL practice problems and test where you stand with your SQL knowledge! Practice is the best way to learn SQL. In this article we show you ten SQL practice exercises for beginners, where you can test your basic SQL knowledge. Use them as a practice or a way to learn new SQL concepts. For more theoretical background and (even more!) exercises, there’s our interactive SQL Basics course.
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13 Apr 2023
Crystal Frazier

How I Used SQL to Advance in My Career

SQL has become increasingly valuable in today’s job market.  In this article, I will share my personal experience with SQL. I hope it will inspire you to grow in your career and achieve your own goals! A few years ago, I felt stuck in a job that I didn’t fully enjoy. Sure, there were aspects of my job that I appreciated, like building budgets, analyzing the performance of promotional programs, and watching my team grow professionally.
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11 Apr 2023
Nicole Darnley

The Best SQL Blogs to Follow

In this article, you’ll find a list of the best SQL blogs and why they’re worth checking out. SQL (short for Structured Query Language) has been around since the 1970s. It’s still a wildly popular coding language. It is based on the idea that data can be structured and built through relations. If you’re familiar with SQL, you’ve likely heard the term “relational database.” This means that the tables of the database have pre-defined relationships between them: One field in one table will match another field in another table.
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6 Apr 2023
Maria Durkin

Best PostgreSQL Courses for Beginners

So you want to learn PostgreSQL but aren't sure how to get started? In this article, we look at some of the best online courses available on the Internet for learning PostgreSQL, so you can get started right away! What Is PostgreSQL? PostgreSQL is used in major companies such as Apple and Instagram. You may be wondering: should I learn PostgreSQL? PostgreSQL is a popular dialect of SQL, or Structured Query Language, a programming language for accessing and managing data in relational databases.
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4 Apr 2023
Maria Durkin

How to Learn SQL in a Week

Need to learn SQL in a hurry? In this article, we’ll give you a learning path that will help you learn SQL in a week! So you want to learn SQL but don't know where to begin, how long it will take, or even if you have the time. In this article, we'll show you how you can learn SQL within a week using some resources that will get your SQL journey started in no time!
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1 Apr 2023
Jakub Romanowski

Course of the Month: SQL Reports in PostgreSQL

If you are looking for a course that takes your PostgreSQL skills to a completely different level, you've come to the right place. You can learn for free in April! We chose SQL Reporting in PostgreSQL for our Free SQL Course of the Month. It's just awesome – I'll tell you why. Do you want to be even better at SQL? Do you know the basics and want your SQL reports to be even more sophisticated?
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30 Mar 2023
Nicole Darnley

How to Use CASE WHEN in GROUP BY

Learn how you can combine SQL CASE WHEN and GROUP BY to create custom categories in your SQL queries. Raw data, by its very nature, is not always human readable. Many times, the data you’re querying is in its most unformatted form. Examples of this include codes for different business departments or product SKUs that represent specific products. To the naked eye, these codes mean nothing, so pulling them into a report is not helpful for the person reading them.
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28 Mar 2023
Tihomir Babic

How to Solve the “must appear in the GROUP BY clause or be used in an aggregate function” Error in PostgreSQL

Learn what causes one of the most common PostgreSQL GROUP BY errors and how you can fix it! As a PostgreSQL user, you surely encounter many error messages when writing an SQL code. Sometimes they are quite unclear, but you won’t need an interpreter for this one: “must appear in the GROUP BY clause or be used in an aggregate function”. This error message mentions GROUP BY and aggregate functions.
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23 Mar 2023
Jill Thornhill

How to Practice Advanced SQL Online with LearnSQL.com

Want to go from intermediate to advanced SQL user? You’ll need to practice! Here are some ways you can practice advanced SQL online. You’ve seen how SQL helps you make data-driven decisions. Perhaps you’ve even learned some advanced features. But you’d like to become an expert—and for that, you need practice, practice, and more practice. Is it possible to get advanced SQL practice online? Taking SQL to the Next Level What is advanced SQL?
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21 Mar 2023
Kamila Ostrowska

Best MySQL Courses for Beginners

SQL is among the most important languages when it comes to dealing with huge amounts of data. If your job includes analyzing or collecting data and you feel that an Excel file is not enough, you need to learn or develop your SQL skills. And if you learn SQL, you also need to know one of its most popular dialects - MySQL. If you've made the decision to learn SQL, you've come to the right place.
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