Using Constraints in Neo4j
Module overview
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. are a specialized type of index that enable you to control if a Full definition for property (opens in a new tab)A named value stored on a node or a relationship. value must exist and/or is unique.
If a constraint is violated when a Full definition for node (opens in a new tab)A vertex in a graph. In a property graph it can carry labels and properties. 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. is created or updated, an error is raised.
Uniqueness constraints are important, especially when large amounts of data are imported into the graph. This enables the graph engine to quickly look up a node and prevent duplication of data.
In this module, you will:
- Learn about the types constraints available in Neo4j and why you would use them.
- Create a uniqueness constraint.
- Create an existence constraint for a node property.
- Create an existence constraint for a relationship property.
- Create a uniqueness and existence constraint for a set of properties (Node key).
- Manage constraints in the graph.
Resources
During this course, you can refer to: