Articles Cookbook
2 Oct 2020
Martyna Sławińska

A Comprehensive Introduction to Window Functions in MySQL

Do a deep dive into the working principles, syntax, and applications of various MySQL window functions. There are many open source databases you could choose; MySQL is consistently one of the most popular. But until 2018, there was no provision for including window functions in MySQL. Fortunately, all that has changed – starting from MySQL 8.0, SQL window functions were now available to MySQL users. Please note that window functions are available only in MySQL 8.
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1 Oct 2020
LearnSQL.com Team

Course of the Month: How to INSERT, UPDATE, DELETE Data

So, you've started learning SQL, and you already know what the SELECT command is and when to use it! Congratulations! Now, it's time to take the next step towards becoming an expert. You need to know the SQL UPDATE, INSERT, and DELETE commands to modify data in your tables. These are the basics that will allow you to work with tables. But what's the best way to learn them? I asked Agnieszka Kozubek-Krycuń, Chief Content Officer at Vertabelo.
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28 Sep 2020
LearnSQL.com Team

New Course: Customer Behavior Analysis in SQL

Good news! A new SQL course is here! We’re happy to announce the release of our Customer Behavior Analysis in SQL course. Do you want to get to know your clients and better understand their needs and behavior? If so, this great interactive SQL course is for you. Discover the power of full customer lifecycle analytics in SQL and know more than your competitors. The LearnSQL.com team is happy to announce the release of a new SQL course on our platform: Customer Behavior Analysis in SQL.
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25 Sep 2020
LearnSQL.com Team

SQL Basics Cheat Sheet

Download this 2-page SQL Basics Cheat Sheet in PDF or PNG format, print it out, and stick to your desk. The SQL Basics Cheat Sheet provides you with the syntax of all basics clauses, shows you how to write different conditions, and has examples. You can download this cheat sheet as follows: Download 2-page SQL Basics Cheat Sheet in PDF format (A4) Download 2-page SQL Basics Cheat Sheet in PDF format (Letter) Download 1-page SQL Basics Cheat Sheet in PDF format (A3) Download 1-page SQL Basics Cheat Sheet in PDF format (Ledger) Download SQL Basics Cheat Sheet in mobile-friendly PDF You may also read the contents here:
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25 Sep 2020
LearnSQL.com Team

SQL JOIN Cheat Sheet

Ready to master SQL JOINs? Get your downloadable cheat sheet now! Your shortcut to becoming an SQL JOINs expert is one click away. Dive deep into the world of SQL JOINs with our detailed SQL JOIN Cheat Sheet, a must-have resource for data enthusiasts at every level. Whether you are just starting out or looking to sharpen your skills, this guide is tailored to provide you with the quick reference needed to use SQL JOINs efficiently.
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24 Sep 2020
Ignacio L. Bisso

What Is the MySQL OVER Clause?

If you want to learn window functions in MySQL, you need to understand the OVER clause. In this article, we use real-world examples to explain what the MySQL OVER clause is, how it works, and why it’s so awesome. In 2018, MySQL introduced a new feature: window functions. Window functions are a powerful SQL feature that perform a specific calculation (e.g. sum, count, average, etc.) on a set of rows; this set of rows is called a “window” and is defined with the OVER clause.
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23 Sep 2020
Jakub Romanowski

SQL Means Business - The Way of an Engineer

Have you been wondering why some companies fail and others achieve success? It's not a matter of luck but of the right people. Łukasz Kubicki at Vertabelo deals with business and product development. I asked him how he started his adventure with programming, how an engineer got into business, and if he liked playing computer games. Here's what he said. If you were to write one sentence about yourself, what would it be?
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18 Sep 2020
Marcin Koryszewski

How Much Do Data Engineers Earn in 2020?

Data engineering is a hot job right now. What does a data engineer do? And just how much do they earn? We’ve done the research for you. If you are reading this, you’re either starting to learn SQL or you already know some and feel it’s time to look around for a SQL job. Maybe you’re in the midst of tackling our Creating Database Structure track. And, let’s be honest, maybe you need some extra motivation to keep on you track.
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17 Sep 2020
Tihomir Babic

How to Use 2 CTEs in a Single SQL Query

Have you ever wondered how to use multiple CTEs in one SQL query? Read this article and find out about recursive CTEs. After learning common table expressions or CTEs, a natural question is “Can I use several CTEs in one query?” Yes, you can! And you can do it quite easily, especially if you already have some basic knowledge of CTEs. Whether you know a bit about CTEs or you’re entirely new to the CTE world, reading about what a CTE is is always a good start.
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16 Sep 2020
Dorota Wdzięczna

How to Join Two Tables in SQL

Querying data from multiple tables is very common when working with relational databases. It is not difficult if you know how to use the dedicated SQL operators for doing this. In this article, you will learn how to join two tables by using WHERE and by using a special operator JOIN, and you will see how to filter rows in the result set. If you want to practice joining tables in SQL, check out our interactive SQL JOINs course.
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