This developer-focused webinar will explain how to use the Cypher graph query language. Cypher, a query language designed specifically for graphs, allows for expressing complex graph patterns using simple ASCII art-like notation and offers a simple but expressive approach for working with graph data. During this webinar you'll learn: -Basic Cypher syntax -How to construct graph patterns using Cypher -Querying existing data -Data import with Cypher -Using aggregations such as statistical functions -Extending the power of Cypher using procedures and functions

1. Intro to Cypher
August 2017William Lyon
@lyonwj

2. William Lyon
Developer Relations Engineer @neo4j
will@neo4j.com
@lyonwj
lyonwj.com

3. Agenda - Introduction To Cypher
• Neo4j Overview
• Cypher Overview
• Hands On Intro To Cypher
• Resources
• Q&A

4. neo4j.com/developer

5. Neo4j Graph Database

9. https://offshoreleaks.icij.org/pages/database

14. https://arxiv.org/pdf/1004.1001.pdf

15. What is Cypher?
Declarative
Query
Language
openCypher
Graph
Pattern
Matching
Bolt /
Drivers
Human
Readable

16. What is Cypher?
Declarative
Query
Language
• What data we want, not
how

17. What is Cypher?
Graph
Pattern
Matching
(node)-[:RELATIONSHIP]->(node)
• What data we want, not
how
• Expressiveness

18. What is Cypher?
Graph
Pattern
Matching
(node {key: value})-[:RELATIONSHIP]->(node)
• What data we want, not
how
• Expressiveness

19. What is Cypher?
Graph
Pattern
Matching
(node {key: value})-[:RELATIONSHIP*..2]->(node)
• What data we want, not
how
• Expressiveness

20. What is Cypher?
Human
Readable
(node)-[:RELATIONSHIP]->(node)
• Focus on domain, not
database

21. What is Cypher?
openCypher
• Open standard for graph
querying
http://www.opencypher.org/

22. What is Cypher?
Bolt /
Drivers
• Binary protocol for Neo4j

23. What is Cypher?
Bolt /
Drivers
• Language Drivers

24. What is Cypher?
Bolt /
Drivers

25. What is Cypher?
Bolt /
Drivers

26. Querying The Graph

27. The Data

28. https://www.yelp.com/dataset_challenge

29. Yelp Data Challenge In Neo4j
https://github.com/johnymontana/neo4j-datasets/tree/master/yelp
“Working With A Real-World Dataset In Neo4j”
https://youtu.be/oXziS-PPIUA

30. Graph Data Model

31. Labeled Property Graph Model

32. Labeled Property Graph Model

33. The Data
user.json business.json review.json

34. Our Data Model
http://www.apcjones.com/arrows/#
• Identify “entities”
• What properties are
relevant?
• Identify unique ids
• Find connections
• Repeat

35. The Graph

36. Querying The Graph

37. What Breweries Near Me That My Friends
Also Like Have The Highest Rating?

38. What Breweries Near Me That My Friends
Also Like Have The Highest Rating?

39. What Breweries Near Me That My Friends
Also Like Have The Highest Rating?
• MATCH …
• (node)-[:RELATIONSHIP]->(node)
• Predicates
• Aggregations
• Ordering
• Graph vs tabular data

40. PROFILE / EXPLAIN
• Query execution plan
• Declarative vs imperative
• Performance tuning

41. CREATE INDEX …
• Indexes are only used to find the starting point for queries.
Use index scans to look up
rows in tables and join them
with rows from other tables
Use indexes to find the starting
points for a query.
Relational
Graph

42. Spatial functionality

43. Extending Cypher - Procedures and
Functions
• Code deployed to database
• Callable from Cypher
• APOC library
• data import
• graph algorithms
• periodic iterate
• MUCH more…
• Neo4j Spatial
• Neo4j-GraphQL

44. Extending Cypher - Procedures and
Functions
• PageRank - friend with highest PageRank?

45. Resources

46. Cypher Refcard
https://neo4j.com/docs/cypher-refcard/current/

47. openCypher
opencypher.org

48. Neo4j Developer Page
neo4j.com/developer

49. Neo4j Sandbox
neo4jsandbox.com

50. (you)-[:HAVE]->(?)
(?)<-[:ANSWERS]-(will)