This talk is an introduction to Sequel, the ruby database library. Sequel provides a simple, powerful, and flexible API for interacting with SQL databases. Sequel allows you to write all your SQL code by hand if you want, but it also allows you to use ruby objects to represent SQL concepts, so that you rarely need to. Sequel includes a comprehensive and extendible ORM with extensive support for manipulating associated objects. Sequel supports advanced database features such as prepared statements, bound variables, savepoints, two-phase commit, transaction isolation, common table expressions, window functions, master/slave configurations, and database sharding.