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Articles
Cookbook
16 Jun 2020
Tihomir Babic
How to Practice SQL Window Functions at Home
Are you looking for a way to maintain your knowledge of SQL window functions? What’s the best way to practice them at home? Here are some suggestions. Learning something new feels great, but it’s also arguably the easiest part of gaining knowledge. You’ve probably experienced that yourself. You struggle with learning an idea, and then you finally get it! There’s the feeling you’ve learned something. And then, very soon, you practically have to start all over again with the very same concepts.
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12 Jun 2020
Jakub Romanowski
Top SQL Social Media Groups & Channels to Follow
We get news, advice, and funny videos from Facebook, Twitter, and YouTube. Why not use social media to help you learn SQL? You wake up and the first thing you do is check for Facebook notifications. Do you take a photo of your breakfast and share it with friends on Instagram? Maybe you argue with someone on Twitter about which James Bond was the best? Or maybe you are recording a short TikTok video of you singing Lady Gaga?
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11 Jun 2020
Kamil Bladoszewski
What’s an SQL Inline Query?
Have you ever heard the term “inline query”? How are they different from subqueries and derived tables? Have you looked this up in numerous places and still don’t know the answer? Let’s embark on a journey and find out together! The first time I heard the term “inline query”, I was a little bit surprised. It doesn’t sound like one of SQL’s nuances and I thought I knew all the basic concepts.
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10 Jun 2020
Dorota Wdzięczna
Monthly SQL Challenges
SQL learners sometimes need challenges. Do you want to test your problem-solving skills or your knowledge of SQL? Then take our monthly SQL Challenges! We prepare them on LearnSQL.com every month. Each Challenge relates to a different interesting topic and will help you keep your SQL game sharp. In this article, you'll discover what our LearnSQL.com Monthly Challenges are and where to find them. We’ll also look at the Challenges collected in our Monthly SQL Challenge Mini Track.
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9 Jun 2020
Kateryna Koidan
Practical Examples of When to Use Non-Equi JOINs in SQL
If you think that two tables in SQL can be joined only using the common field, you will be excited to learn that there are other ways of joining. Non-equi JOINs use different kinds of comparison operators in the JOIN condition. In this article, I’ll guide you through non-equi JOIN examples to show the common use cases for this type of JOIN. Equi JOIN vs. Non-Equi JOIN How do you usually join two tables in SQL?
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4 Jun 2020
Pierre Timms
How to Convince Your Boss You Need SQL Training
Learning SQL is a great goal. Now, if you could only convince your boss that it’s good for the company as well as for you ... You’re aware of the benefits of adding SQL to your skill set. You believe that the rewards gained from you learning SQL will also benefit your employer – it’s not just another way for you to develop your professional profile. But how do you articulate this to your boss?
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3 Jun 2020
Rebecca McKeown
Top 5 Programming Languages to Learn Alongside SQL
If you already know or are about to learn SQL, you’re well on your way to being a sought-after database administrator, database engineer, or just a general database whizz kid! SQL is a modern, widely-used language that finds application in almost every industry. There is no shortage of jobs with SQL. But what if you want to branch out and learn another language to complement your SQL knowledge and skills?
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2 Jun 2020
Zahin Rahman
How to Learn SQL JOINs
JOINs are one of the most fundamental and commonly used SQL commands for manipulating and querying real-world data sets. They are also one of the more challenging SQL topics to master! In this article, you’ll learn an effective strategy to learn the different types of SQL JOINs. When data is stored in a single table, we can easily retrieve rows and get all the information we need. But when businesses scale, so does their data.
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1 Jun 2020
LearnSQL.com Team
New SQL Monthly Challenge for June 2020!
The new LearnSQL.com Monthly Challenge is ready! In June, we invite you to use your SQL skills to analyze insurance agency activities. Is this the first time you’ve ever come across our Monthly Challenge? Then you should know that it’s a set of 5 to 10 SQL exercises prepared for people who want to practice what they’ve learned. Each challenge is designed around a specific theme. In this seventh challenge, the exercises are built around a fictional insurance agency, but in the other challenges we’ve explored the subjects of pizza, the stars, a car workshop, and bakery management.
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29 May 2020
Kateryna Koidan
What Are the Different Types of SQL Subqueries?
Subqueries can be used in many business cases. What subquery types does SQL offer? And how can you use them efficiently? In this article, I’ll guide you through different subquery types and the typical situations when they are useful. What Is an SQL Subquery? A subquery, or nested query, is a query placed within another SQL query. There are many different scenarios where you may want to include a query in the WHERE, FROM, or SELECT clauses of your main query.
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