Skip navigation
Courses
Pricing
For Students
SQL Library
Articles
Cookbook
Cheat Sheets
For Beginners
Best Way to Learn SQL
SQL Primer
Flashcards
About Our Courses
Guides
150+ SQL Practice Exercises
100+ SQL Interview Questions
SQL Interview Cheat Sheet
GROUP BY and Aggregate Functions Guide
SQL JOINs Guide
Window Functions Guide
Numeric Functions Guide
String Functions Guide
Common Table Expressions
Log in
Create free account
fullName
User profile menu open
Open user profile menu
fullName
Dashboard
My Profile
Payment & Billing
Log out
MENU
CLOSE
Courses
Pricing
For Students
Articles
Cookbook
Cheat Sheets
Best Way to Learn SQL
SQL Primer
Flashcards
About Our Courses
150+ SQL Practice Exercises
100+ SQL Interview Questions
SQL Interview Cheat Sheet
GROUP BY and Aggregate Functions Guide
SQL JOINs Guide
Window Functions Guide
Numeric Functions Guide
String Functions Guide
Common Table Expressions
Dashboard
My Profile
Payment & Billing
Log in
Create free account
Log out
Articles
Cookbook
17 Nov 2024
Jakub Romanowski
Black Week Sale: Master SQL With up to 75% Off
Black Week has arrived and LearnSQL.com is offering unbeatable discounts for those looking to learn SQL and enhance their data skills. With up to 75% off, now is the ideal time to master SQL without overspending. Now is the perfect time to invest in your professional growth: get 75% off our All Forever Package. This isn't just a discount—it's your chance to boost your data analysis skills without overspending. Whether you're a complete beginner or have some SQL experience, our Black Week offer provides high-quality, flexible learning options at unbeatable prices.
Read more
14 Nov 2024
Gustavo du Mortier
INNER JOIN vs. OUTER JOIN: What’s the Difference?
Deciding when to use INNER JOIN vs. OUTER JOIN is often challenging for beginners. In this article, you will find explanations and examples that will help you better understand the difference between these two joins. In SQL, JOINs allow you to combine data from different tables; INNER JOIN and OUTER JOIN are simply types of JOIN statements. Understanding their differences is critical if you work with relational databases. It is also crucial if you’re going for an SQL job interview: the difference between INNER JOIN and OUTER JOIN is among the most frequently asked SQL interview questions.
Read more
12 Nov 2024
Jakub Romanowski
Your New Personalized SQL Learning Plan
SQL may not be as flashy as some other programming languages, but it's an absolutely essential skill if you're working with data. Whether you're aiming for a career in data analysis, managing databases, or even just looking to boost your current role, SQL is the tool that will make you more efficient. The best part? You don’t need a degree in computer science to learn it. Think of SQL as the key that opens doors to data.
Read more
7 Nov 2024
Maria Durkin
SQL Pivot Tables: A Step-by-Step Tutorial
Are you a data analyst looking to better your abilities? Or perhaps you want to discover what tools you need to succeed in this role? Today, we're going to look at one of the most important tools for data analysts: the SQL pivot table. An SQL pivot table is an essential tool for quickly arranging and summarizing data. In just a few lines of code, it helps analysts rapidly and effectively identify patterns and trends in data.
Read more
5 Nov 2024
Valentyn Kucherenko
LearnSQL.com’s Top Free SQL Resources
In this article, you’ll get an overview of the top 10 free SQL resources from LearnSQL.com. I’ll start with the most basic and progress towards more advanced resources. Each one of those was carefully crafted to help you learn SQL. Whether you are taking your first steps in your professional path or already have some experience with SQL, you’ll need plenty of SQL training tools if you want to get good at this language.
Read more
1 Nov 2024
Jakub Romanowski
Course of the Month: Customer Behavior in PostgreSQL
Ever wondered how top businesses understand their customers so well? The secret lies in data analysis, and we're offering you the key – for free – in our Customer Behavior Analysis in PostgreSQL course! Are you familiar with the basics of PostgreSQL and eager to delve deeper into customer behavior analysis? Our November 2024 Course of the Month, Customer Behavior Analysis in PostgreSQL, has you covered! And the best part?
Read more
31 Oct 2024
Jakub Romanowski
What Tools do I Need to Use SQL? A Guide For Beginners in Data Analysis
Welcome! In this guide, I’ll introduce you to the most essential SQL tools to help you start working with data quickly and efficiently. Whether you're new to SQL or looking to improve your skills, these tools will simplify your workflow and accelerate your progress. When I started learning SQL, I felt overwhelmed. So many databases, tools, and platforms were out there and I didn't know where to begin. But, after some time, I realized it’s not about knowing everything—it’s about understanding the right tools to help you along the way.
Read more
30 Oct 2024
LearnSQL.com Team
New Monthly SQL Practice for November 2024!
Ready for a new advanced SQL challenge? Help Nolan Roots, the owner of a landscaping business, by analyzing his sales data and compiling important reports about his clients. Get ready to dive into the world of SQL queries as you help Nolan improve his business. Welcome to the November SQL Practice course! In our November 2024 SQL Practice, you will help Nolan, the owner of a landscaping business. He has hired you, an SQL specialist, to gain important insights into his business.
Read more
29 Oct 2024
Ekre Ceannmor
SQL Project for Beginners: AdventureWorks Sales Dashboard
Building an SQL project on your own is a great way to sharpen your skills and gain practical experience. This SQL project example for beginners will show you how to create a sales dashboard with SQL and the AdventureWorks sample database. If you're an SQL beginner who wants to take their skills beyond simple query exercises, it’s a good idea to tackle an SQL data analysis project. Not only will it challenge you to apply what you've learned, it will also give you a deeper understanding of how SQL works in real-world scenarios.
Read more
24 Oct 2024
Agnieszka Kozubek-Krycuń
NULLs and Handling Missing Data in SQL
Handling missing data (i.e. NULLs) in SQL can be challenging. NULLs can pose a lot of traps, especially if you don’t understand how they work. In this article, we’ll talk about dealing with NULL in SQL. We’ll also explain how to avoid common mistakes when working with NULLs. Having missing data in your database is an unavoidable reality of life. There are many reasons why you may have missing data in your database: the complete data isn’t yet available, users provide incomplete information, changes to the database schema, database malfunctions, human error, and more.
Read more
««
«
1
2
3
80
»
»»