1.1 · Video Lesson

Constraints and Indexes in Neo4j

A Full definition for constraint (opens in a new tab)A rule the database enforces on every node or relationship with a given label or type, rejecting any write that breaks it. is implemented internally as an index and is used to constrain what is added to the graph. There are three types of constraints you can define:

Uniqueness for a single Full definition for node (opens in a new tab)A vertex in a graph. In a property graph it can carry labels and properties. Full definition for property (opens in a new tab)A named value stored on a node or a relationship. value.
Existence for a property of a node or Full definition for relationship (opens in a new tab)A named, directed connection between two nodes. Every relationship has a type, a start node and an end node..
Existence and uniqueness for a set of node property values (called a Node key).