Articles Cookbook
28 Jun 2022
Kateryna Koidan

What Is SQL?

What is SQL SQL, or Structured Query Language, is a programming language used to talk to databases. With SQL, you can store, manipulate, and retrieve data from relational databases. What Can You Do with SQL Retrieve data from a database. Filter and sort data from a database. Perform computations on database data. Insert records into a database. Update existing records in a database. Delete records from a database. Create new databases.
Read more
23 Jun 2022
Tihomir Babic

An Overview of Microsoft SQL Server Text Functions

Data analysts use text values when creating SQL reports. You can create your own labels with functions, classify rows based on text value, or do computations based on it. This article covers how to do all that. The text values in databases are not just for reading. As with numeric values, we perform operations on them and manipulate the text. SQL Server has a fair number of text functions.
Read more
21 Jun 2022
LearnSQL.com Team

Prepare for a SQL Interview with LearnSQL.com

You've been working hard to get a SQL interview at your dream company. Now they’ve called – and you need to prepare if you’re going to ace it. In this article, I’ll show you the most efficient way to prepare for a job interview using the interactive SQL courses at LearnSQL.com. SQL is an essential skill for anyone working with data. Wanna be a data analyst, data scientist, software engineer, or tester?
Read more
16 Jun 2022
Himanshu Kathuria

Learn SQL in 4 Steps

Want to work with data? You’ll need SQL. Fortunately, you can learn SQL in just 4 steps! If you are interested in data crunching or working with data in general, you’ve probably heard something about SQL. Now that data storage is cheap and accessible, data from every transaction can be stored and analyzed. Hence, there’s great demand for people who can capture and work with this data. We’ve even seen entire companies profit from being proficient with data; for example, consider the ever-growing value of Google and Facebook (now Meta).
Read more
14 Jun 2022
Himanshu Kathuria

These SQL Queries Will Help You With Data Analysis

Need to streamline your everyday data analysis tasks? This article explains how basic SQL queries can help. If you are planning a corporate career or any field that involves working with data, you must have come across SQL, or Structured Query Language. SQL was first developed in the 1970s and it continues to be the industry standard for database interactions. Many of you may already have decided to learn this language, given how powerful it is.
Read more
9 Jun 2022
András Novoszáth

5 Tips for You From a Senior SQL Data Analyst

Are you looking for tips for becoming a better data analyst? Do you want to know about the mistakes and issues you may face? I have collected five tips for your everyday work based on my experience as a data analyst. You may have already read about what data analysts do, how much they earn, and how to become one. However, there is more to it than just becoming a data analyst.
Read more
7 Jun 2022
Tihomir Babic

How to Combine Two Aggregate Functions in SQL

Having trouble using two aggregate functions in one query? This article will show you how to do it the right way – actually, the two right ways. In data analysis and reporting, we often need to count the number of records or sum them up and then calculate the average of this count or sum. Translated to SQL logic, this is the aggregation of aggregated data, or multi-level aggregation. For aggregation purposes, there are the SQL aggregate functions.
Read more
1 Jun 2022
Jakub Romanowski

Course of the Month: PostGIS

What is PostGIS, and why should you learn it? (Hint: Our SQL PostGIS course is free throughout June 2022!) Did you know databases can store geographic data? This is how interactive maps are made, most often based on PostGIS. In this article, I will tell you what PostGIS is and why it’s worth learning. Moreover, I am going to offer you an awesome online PostGIS SQL course which you can do for free during June 2022!
Read more
31 May 2022
Dorota Wdzięczna

How to Install a MySQL Database on a Windows PC

Do you want to install a MySQL database on your Windows computer? And maybe find out how to start using a MySQL database? In this article, we’ll cover the installation process. MySQL is one of the most popular relational database servers. This is one reason to start using a MySQL database. Among the various editions of MySQL delivered by Oracle, the Community edition is available for free. You can download it from the MySQL website.
Read more
26 May 2022
Marcin Koryszewski

Over 40 and Want to Upskill? Learn SQL!

You have several years of experience. Your work has even been written up in a few case studies. Yet, you still have a hard time finding the right path to improve your career. If that's true for you, the answer is to learn SQL. In this article, I'll tell you why. Why learn SQL when you’re already an experienced professional? It’s always good to learn something new. You may want to pick up a new hobby, try out a different industry, or get a new skill to help your career.
Read more