The INSERT OVERWRITE statement allows you to overwrite existing nodes in the graph. If no existing node with the same _id is found, it inserts a new node instead.
The overwrite operation works by deleting the existing node with the same _id first, then inserting the new node. This means all properties and labels of the existing node are replaced with the new definition.
To merge new properties into an existing entity instead of replacing it, use UPSERT.
An existing node will be overwritten if _id is included in the property specification and a node with that _id exists in the graph:
GQLINSERT OVERWRITE (:User {_id: "U2", name: "Jumpy88"})
If a node with _id equal to U2 already exists, it will be deleted and replaced with the new node. If no such node exists, a new node will be inserted.
If _id is not specified, a new node is always inserted:
GQLINSERT OVERWRITE (:User {name: "Jumpy88"})
Since the property specification does not include _id, a new node will be inserted with a system-generated _id.
