neo4j-query

Neo4j Query Skill

Query the Neo4j knowledge graph to investigate entities, relationships, and graph structure.

Connection Details

• URI: bolt://localhost:7687 (or NEO4J_URI env var)
• User: neo4j (or NEO4J_USER env var)
• Password: refinerypass (or NEO4J_PASSWORD env var)

Python Usage

from qq.knowledge.neo4j_client import Neo4jClient

# Initialize client
client = Neo4jClient()

# Execute raw Cypher query
results = client.execute("MATCH (n) RETURN n LIMIT 10")

# Get graph summary (entity and relationship counts by type)
summary = client.get_graph_summary()

# Get entity by name
entity = client.get_entity("entity_name")

# Get related entities (up to N hops)
related = client.get_related_entities("entity_name", depth=2, limit=20)

# Close when done
client.close()

Common Cypher Queries

Count entities and relationships

-- Total entities
MATCH (n) RETURN count(n) as total_entities

-- Entities by type
MATCH (n) RETURN labels(n)[0] as type, count(n) as count ORDER BY count DESC

-- Total relationships
MATCH ()-[r]->() RETURN count(r) as total_relationships

-- Relationships by type
MATCH ()-[r]->() RETURN type(r) as type, count(r) as count ORDER BY count DESC

Find orphan entities (no relationships)

-- Entities with no incoming or outgoing relationships
MATCH (n) WHERE NOT (n)--() RETURN n.name, labels(n)[0] as type

Analyze connectivity

-- Entities with most connections
MATCH (n)-[r]-() RETURN n.name, labels(n)[0] as type, count(r) as connections ORDER BY connections DESC LIMIT 10

-- Distribution of relationship counts per entity
MATCH (n)
OPTIONAL MATCH (n)-[r]-()
WITH n, count(r) as rel_count
RETURN rel_count, count(n) as entities_with_this_count ORDER BY rel_count

Sample entities and relationships

-- Sample entities with their properties
MATCH (n) RETURN n.name, labels(n)[0] as type, n.description LIMIT 20

-- Sample relationships with endpoints
MATCH (a)-[r]->(b) RETURN a.name, type(r), b.name LIMIT 20

CLI Usage

# Use cypher-shell directly
docker exec -it qq-neo4j-1 cypher-shell -u neo4j -p refinerypass "MATCH (n) RETURN count(n)"