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.
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.
