jtomek commented on issue #1709:
URL: https://github.com/apache/age/issues/1709#issuecomment-2037568630

   I second the idea of implementing ON CREATE and ON MERGE. 
   This would significantly help with business logic needed to prevent 
duplicates.
   
   A few neo4j examples as food for thought:
   
   ```cypher
   MERGE (keanu:Person {name: 'Keanu Reeves'})
   ON CREATE
     SET keanu.created = timestamp()
   ON MATCH
     SET keanu.lastSeen = timestamp()
   RETURN keanu.name, keanu.created, keanu.lastSeen
   ```
   
   ```cypher
   MERGE (person:Person)
   ON MATCH
     SET
       person.found = true,
       person.lastAccessed = timestamp()
   RETURN person.name, person.found, person.lastAccessed
   ```


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