Q: How can I ensure that all nodes in a graph database like AGE are unique? I am using AGE to create a graph database, and I want to ensure that all nodes in my database are unique. I want to avoid having multiple nodes with the same properties and labels in my graph.
For example, if I have a node with label Person and properties name and age, I want to ensure that there is only one node with the label Person and the same name and age properties. If a second node is created with the same label and properties, I want to prevent it from being added to the database, or find a way to merge the two nodes into one.

A: You can write a constraint to prevent any duplicates in your graph database like:
CREATE CONSTRAINT ON (p:Person)
ASSERT (p.name, p.age) IS NODE KEY

Further, you can also use a MERGE statement which creates a new node if it does not already exists or updates the properties of the existing node.
