This document discusses building machine learning recommendation engines using SQL. It begins with an overview of data and analytics trends including the convergence of operational and analytical databases. The rise of machine learning is then covered along with how databases are integrating machine learning capabilities. A live demo is presented using the Yelp dataset to build a recommendation engine directly in SQL, leveraging the database's extensibility, stored procedures, and user defined functions. The document argues that training can be done externally but operational scoring can and should be done directly in the database for real-time applications.