All courses available at Tutorialspoint.com, including the "Learn SQL" tutorial, can be accessed without registration. It's worth mentioning that you can download the whole tutorial as a PDF file to get back to it at any time, even when offline. 7. Udacity - "Intro to Relational Databases...
SQL Tutorial: Learn SQL for Free - Our SQL tutorial helps you learn SQL (Structured Query Language) in simple and easy steps so that you can start your database programming quickly. It covers most of the important concepts related to SQL for a basic to a
PL/SQL, which stands for Procedural Language extensions to the Structured Query Language (SQL). It is a combination of SQL along with the procedural features of programming languages. It was developed by Oracle Corporation in the early 90's to enhance th