The Facebook Presto interactive SQL-on-Hadoop engine is now open source. Presto is Facebook’s take on Cloudera’s Impala or Google’s Dremel, and it already has some big-name fans in Airnb and Dropbox.

MySQL and PostgreSQL are two of the most used open source SQL databases, and both fulfill the role of a general-purpose database well. How do you choose which one to use for a project? Let's look at ...