Current popular cloud databases aren't native to serverless—you have to pay for capacity you don’t use. Additionally, they often lack support for joins, indexes, authentication, and other capabilities necessary to build a rich application.
See how FaunaDB (https://fauna.com/)'s data and operations model fits serverless applications like a glove. The core of the talk is a live code session showing an app using the Serverless.com framework to run real world queries in FaunaDB. If you haven't coded with the Serverless framework before you'll be comfortable picking it up after this.
Presenter: Chris Anderson (https://twitter.com/jchris?lang=en)