The graph schema I have is (actors)-[:ACTED_IN]->(movies).
I know how to find actors who have worked with a particular actor as below:
MATCH (actor {name:"Tom Hanks"} )-[:ACTED_IN]->(movies)<-[:ACTED_IN]-(costars)
return distinct costars;
I know how to find all the actors who have worked in some movie:
MATCH (all_actor)-[:ACTED_IN]->(movies) return distinct all_actor;
However I don't know how to find all actors not in costars. How do I go about it?
Answer
As you want to deduct the coactors from the global list of actors this is not the best graph query, here are some suggestions.
// Max de Marzi
MATCH (actor:Actor {name:"Tom Hanks"})-[:ACTED_IN]->(movie), (other:Actor)
WHERE NOT (movie)<-[:ACTED_IN]-(other)
RETURN other
// Wes Freeman
MATCH (actor:Actor {name:"Tom Hanks"}), (other:Actor)
WHERE NOT (actor)-[:ACTED_IN]->()<-[:ACTED_IN]-(other)
RETURN other
// Michael Hunger
MATCH (actor:Actor {name:"Tom Hanks"} )-[:ACTED_IN]->(movies)<-[:ACTED_IN]-(coactor)
WITH collect(distinct coactor) as coactors
MATCH (actor:Actor)
WHERE NOT actor IN coactors
RETURN actor