Q 22: Which query returns works authored by someone who is also a Researcher?

Question

BlackTom AI · Accepted Answer

Label matching in Cypher is the key concept: writing (p:Researcher) in a MATCH pattern restricts p to nodes that carry the Researcher label; the expression WHERE p:Researcher is an equivalent runtime check; and writing (p:Person:Researcher) requires the node to have both Person and Researcher labels. All three syntactic forms therefore identify authors who are Researcher nodes.

Step-by-step reasoning for each option:
1) MATCH (p:Researcher)-[:AUTHORED]->(w:Work) RETURN w.title
   - The pattern requires p to have the Researcher label and the relationship AUTHORED to point to a node with label Work. This returns titles of Work nodes whose author is a Researcher.

2) MATCH (p:Person)-[:AUTHORED]->(w:Work) WHERE p:Researcher RETURN w.title
   - This first matches any Person node that authored a Work, then the WHERE clause filters those p nodes to only those that have the Researcher label. The result is identical (for purposes of returned works) to the first query: Work titles authored by nodes that are also Researcher.

3) MATCH (p:Person:Researcher)-[:AUTHORED]->(w) RETURN w.title
   - The node pattern p:Person:Researcher requires both labels on p (so p is a Researcher). The target node w is not restricted to a label here, but the query still returns titles of nodes reached by an AUTHORED relationship from a Researcher author. If your data models works with the Work label, those will be returned; if not, it still returns whatever nodes (with title property) the Researcher authored.

Why "All of the above" is correct:
- Each of the three query forms ensures the author node carries the Researcher label (either in the pattern or via WHERE), so each returns works authored by someone who is also a Researcher.

Why other options are incorrect:
- Choosing any single concrete query (options 1–3) ignores that the other forms are also valid, so they are incomplete answers.
- "None of the above" is wrong because all three shown queries do return works whose author is a Researcher.

Conclusion: The correct answer is "All of the above," which matches the provided authoritative answer.

Q 22: Which query returns works authored by someone who is also a Researcher?单项选择题

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