Ever tried to learn SQL, the query language that lets you poke at the innards of databases? Most tutorials start by having you create your own database, fill it with nonsense, and then run queries ...

Today, Codecademy launched a free Learn SQL interactive course that will teach you the basics of tables, queries, aggregate functions, and more.

Checking your logic and knowing how things work in practice is a necessary requirement. So why is SQL still the leading way to work with data today, 50 years after it was first designed and released?