This course is one of five self-paced courses on the topic of Databases, originating as one of Stanford's three inaugural massive open online courses released in the fall of 2011. The original "Databases" courses are now all available on edx.org. This course builds on concepts introduced in Databases: Relational Databases and SQL and is recommended for learners seeking to understand On-Line Analytical Processing (OLAP) and/or recursion in the SQL language.