SET - FalkorDB Docs

The SET clause is used to create or update properties on nodes and relationships.

Setting a Single Property

To set a property on a node:

GRAPH.QUERY DEMO_GRAPH "MATCH (n { name: 'Jim' }) SET n.name = 'Bob'"

Setting Multiple Properties

You can set multiple properties in a single SET clause by separating them with commas:

GRAPH.QUERY DEMO_GRAPH
"MATCH (n { name: 'Jim', age:32 })
SET n.age = 33, n.name = 'Bob'"

Setting Properties from a Map

You can set properties using a map. There are two operators with different behaviors:

Replace All Properties (`=`)

Replaces all existing properties with the map properties:

GRAPH.QUERY DEMO_GRAPH
"MATCH (n { name: 'Jim', age:32 })
SET n = {age: 33, name: 'Bob'}"

Result: The node will have only the properties age and name. Any other existing properties are removed.

Merge Properties (`+=`)

Updates only the specified properties while keeping other existing properties:

GRAPH.QUERY DEMO_GRAPH
"MATCH (n { name: 'Jim', age:32 })
SET n += {age: 33}"

Result: The node’s age is updated to 33, but name and any other properties remain unchanged.

Copying Properties Between Entities

You can copy all properties from one entity to another:

GRAPH.QUERY DEMO_GRAPH
"MATCH (jim {name: 'Jim'}), (pam {name: 'Pam'})
SET jim = pam"

After executing this query, the jim node will have exactly the same properties as the pam node (all of Jim’s original properties are replaced).

Removing Properties

To remove a property, set its value to NULL:

GRAPH.QUERY DEMO_GRAPH "MATCH (n { name: 'Jim' }) SET n.name = NULL"

This removes the name property from the node entirely.

Frequently Asked Questions

What is the difference between SET n = map and SET n += map?

The = operator replaces all existing properties with the map values. The += operator merges properties, updating only specified keys while keeping other existing properties intact.

Can I remove a property using SET?

Yes. Setting a property to NULL removes it: SET n.name = NULL. This is equivalent to using the REMOVE clause.

Can I copy properties from one node to another?

Yes. Use MATCH (a), (b) SET a = b to copy all of bs properties to a, replacing any existing properties on a.

Can I SET multiple properties at once?

Yes. Separate property assignments with commas: SET n.age = 33, n.name = 'Bob'. All assignments are applied in a single operation.

​Setting a Single Property

​Setting Multiple Properties

​Setting Properties from a Map

​Replace All Properties (=)

​Merge Properties (+=)

​Copying Properties Between Entities

​Removing Properties

​Frequently Asked Questions