Articles Cookbook
20 Mar 2025
Valentyn Kucherenko

SQL 101: a Beginner’s Guide to SQL Database Programming

In this article, I will introduce you to the concept of SQL and give you the very first lesson about how SQL can help you navigate the world of relational databases with speed and precision. This SQL 101 is designed to make your learning smooth, offering clear explanations and practical examples to help you build a solid foundation in SQL. Data is part of almost everything you do. Whether you’re shopping online, checking your bank balance, or booking an Uber ride, databases store and manage the information behind the scenes.
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18 Mar 2025
LearnSQL.com Team

Full Solution to Lost at SQL – Learn SQL Game

A game is a fun way to learn SQL. Let’s take a look at a full solution to one of the most popular SQL games, Robin Lord’s Lost at SQL! SQL games are a great interactive way to practice your SQL skills. If you are bored with video courses and textbooks, a game can help you solidify and even learn SQL. Lost at SQL is one of the most popular SQL games.
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13 Mar 2025
Jakub Romanowski

How to Transition From Excel to SQL: A Data Analyst's Perspective

If you work with data, chances are you’ve spent countless hours in Excel – filtering data, writing formulas, and dragging cells across columns. Excel is a great tool but, at some point, it starts to slow you down. Huge files crash. VLOOKUPs become a nightmare. PivotTable takes forever to update. That’s when SQL comes in. It’s like Excel’s powerful, more scalable sibling. And the best part? If you know Excel, you already understand many SQL concepts.
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11 Mar 2025
Valentyn Kucherenko

Who is a Marketing Analyst and how do you Become one?

If you’re looking to combine marketing expertise with data analysis, becoming a marketing analyst is the perfect career path. This exciting role primarily focuses on measuring campaign success, tracking customer behavior, and helping businesses make smarter decisions. In this article, I will share all you need to know to become a marketing analyst. What is Marketing Analytics Marketing isn’t just about creativity anymore. Sure, great copy and eye-catching visuals still matter, but data is what drives real decision-making.
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6 Mar 2025
Agnieszka Kozubek-Krycuń

What are the Differences Between Database Engines? An Overview for Beginners

If SQL is a standard language, why do databases like MySQL, SQL Server, Oracle, and PostgreSQL all exist? Do their differences matter? This article explains what sets them apart and why it’s useful to know – even if you’re not a database expert. My husband is a software tester. Occasionally, he uses SQL to pull data from a database – like checking if a user with access to three open projects sees the correct list, or modifying data for testing purposes.
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4 Mar 2025
LearnSQL.com Team

LeetCode SQL Problem & Solution: Department Top Three Salaries

Looking for a detailed explanation of the hardest exercise in the LeetCode SQL 50? We have compiled a detailed explanation of this SQL problem, with the thought process behind the solution and instructions on how to build the query step-by-step. LeetCode is a popular online platform that offers a variety of SQL problems designed to help you learn, practice, and prepare for interviews. They also offer programming problems in other languages.
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3 Mar 2025
Jakub Romanowski

Course of the Month: Window Functions in PostgreSQL

Are you looking for the best way to master SQL window functions? Throughout March 2025, you can access the interactive course Window Functions in PostgreSQL for free. Boost your skills at no cost. 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.
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27 Feb 2025
Ekre Ceannmor

SAS vs. SQL: What’s the Difference?

Want to become a data analyst? Not sure which data analysis language to start with? This article will help you choose between SAS and SQL – two of the most popular tools. Are you looking into a career in data analysis? You will probably encounter names like SQL and SAS in job advertisements and job descriptions. The tools may seem similar at first glance, but they actually serve different purposes.
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27 Feb 2025
LearnSQL.com Team

New Monthly SQL Practice for March 2025!

If you are a more advanced SQL user who is comfortable using CASE WHEN, GROUP BY, aggregate functions, and common table expressions (CTEs), you can check your knowledge with the March SQL Practice. On LearnSQL.com, you‘ll find a new challenge to solve every month. Maybe this is the first time you’ve come across our Monthly SQL Practices. LearnSQL.com offers one SQL Practice each month: at the basic level on even-numbered months and at the advanced level on odd-numbered months.
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24 Feb 2025
Jakub Romanowski

The Most Common PostgreSQL Commands: a Beginner's Guide

PostgreSQL is more than just a database – it’s the trusted tool behind some of the most demanding data projects out there. From analyzing sales trends to powering apps with real-time data, PostgreSQL commands let you take control of your data with precision and speed. In this article, I’ll walk you through the most common PostgreSQL commands that beginners need to know. Did you know that PostgreSQL is one of the most loved databases out there?
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