In this tutorial, we will step through installing PostgreSQL, connecting to the database, loading some data, and running a variety of SQL queries.

Read this SQL tutorial to learn when to use SELECT, JOIN, subselects and UNION to access multiple tables with a single statement.

SWObjects can also rewrite SPARQL queries in SQL, effectively including relational databases alongside SPARQL endpoints in a linked data federation.

We list the best SQL online courses, to make it simple and easy to learn how to mange, code, and run databases, covering everything from beginner to advanced users. The Structured Query Language ...