If you want to build online applications, you almost invariably will need to work with a database, and the language behind most modern databases is SQL. Go far beyond the basics of SELECT, INSERT, and UPDATE with the extensive series of online courses in the Ultimate SQL Bootcamp.
You’ll start with the basics, but by the end, you’ll know how to query your database like a boss. There are lessons for SQL Server and MySQL databases, along with training on integrating PHP applications with MySQL from scratch, and even how SQL comes in handy for non-technical marketing folks.
In all, there are 9 course tracks, valued at over $400, but you can sign up for the Ultimate SQL Bootcamp in the Technabob Shop for just $49 for a limited time.