In this lesson, we’ll learn how to read pre-inserted data in the sample database using Fetch queries. We’ll begin by seeing how we can retrieve entities and relations in a similar way to how we do with relational databases. We’ll then see how we can retrieve data in unique ways using TypeDB: by writing declarative polymorphic queries, by leveraging rule inference, and by retrieving types from the schema. Finally, we’ll look at a few examples of type inference at work by seeing how TypeDB validates queries.