It sometimes seems like all domains easily map onto relational database like MySQL and Postgres — that we live in a happy land where all Employees are People, and all People are Mammals. Unfortunately, however, there are many domains that just don't map so easily onto a standard relational schema. In this session, we'll look at three general alternatives to the familiar model, as illustrated by some specific examples. We'll also see how some alternative databases provide a better fit for specific domains.