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Lesson 5: Defining schemas

Overview

In this lesson, we’ll learn how to define entity, relation, and attribute types using Define queries. We’ll start by defining individual types and their interfaces, namely ownership interfaces for attributes and role interfaces for relations. We’ll then see how we can define type hierarchies for entities, relations, and attributes. We’ll also see how we can apply different kinds of value constraints to attributes and define rules to infer new data. Finally, we’ll see how TypeDB validates changes to the schema to ensure it stays in a consistent state.

  • You should complete Lesson 4 before starting this lesson.

TypeQL keywords introduced

  • define

  • value

  • abstract

  • as

  • @key

  • @unique

  • regex

  • rule

  • when

  • then

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