Introduction to SQL

In our introduction to SQL lesson, you’ll learn the basics of SQL and explore a data set.

SQL skills are critical for any kind of data work, because they’re generally necessary for querying the databases virtually all companies use to store their data. SQL is also one of the most common technical skills for companies to test during the job application process.

(Read more about why you need to learn SQL).

In this lesson, which is the first lesson of our SQL Fundamentals course, you will learn the basic components of a SQL query, including commands such as:

  • SELECT and FROM to select the data you want
  • WHERE to filter your data
  • AND and OR to filter by multiple conditions at once
  • ORDER BY and LIMIT to control your output and results

Sign up for a free account to try this course right now in our interactive app. You’ll be writing real SQL queries right in your browser to pull, filter, and analyze data from a real database.

SQL is everywhere.

Almost all of the biggest names in tech use SQL — which is pronounced either “sequel” or “S.Q.L.” Companies like Facebook, Google, and Amazon have built their own high-performance database systems, but even their data teams use SQL to query data and perform data analysis. And it’s not just tech companies: companies big and small around the world use SQL.

SQL is here to stay.

The Stack Overflow annual Developer Survey, which is the largest and most comprehensive survey of programmers around the world, consistently reveals that SQL is one of the most popular technologies used today.

Check out this Dataquest blog post if you’d like to learn more about why it’s important to learn SQL. And if you’d like to learn more about how to learn SQL online with Dataquest, check out this blog post for some tips and tricks to learn SQL online.

So, let’s learn about the language itself and how you can use it to query data.

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