(:Person {id: 'thiago'})-[:KNOWS]->(:Competency {id: 'neo4j'})

match (p:Person)-[:KNOWS]->(c:Competency) where c.id in ['java','haskell'] return p.id;

match (p:Person)-[:KNOWS]->(c:Competency) where c.id in ['java','haskell'] return p.id, count(c);