MongoDB is a very popular noSQL Database (not only Structured Query Language) used by Disney, Craigslist, New York Times, EBay, Cisco... You can get the courses free from their "MongoDB University" here: https://university.mongodb.com/ When you've passed the requisite courses, you can write a certifying exam as a MongoDB Database Administrator (DBA) or MongoDB Developer, depending which track you chose. Courses are free and I believe the exams cost around $150 each. Cool, for a skill in demand.
