An introduction to graph databases and Neo4j.

1. Intro to Neo4j
by Nicole White
Data Scientist at Neo4j
@_nicolemargaret

2. Agenda
What is a
Graph?
What is
Neo4j?
Data
Modeling
Cypher
Query
Language
Neo4j
Browser
Demo
Next Steps

3. What is a Graph?

4. Are These Graphs?
0
1
2
3
4
5
6
Category 1 Category 2 Category 3 Category 4
Series 1 Series 2 Series 3
0
2
4
6
8
10
12
14
Category 1 Category 2 Category 3 Category 4
Series 1 Series 2 Series 3
What is a Graph? What is Neo4j? Data Modeling
Cypher Query
Language
Neo4j Browser Demo Next Steps

5. This is a Graph
What is a Graph? What is Neo4j? Data Modeling
Cypher Query
Language
Neo4j Browser Demo Next Steps
Node
Relationship

6. Twitter Social Graph
What is a Graph? What is Neo4j? Data Modeling
Cypher Query
Language
Neo4j Browser Demo Next Steps

7. Internet Graph
What is a Graph? What is Neo4j? Data Modeling
Cypher Query
Language
Neo4j Browser Demo Next Steps

8. What is Neo4j?

9. What is a Graph? What is Neo4j? Data Modeling
Cypher Query
Language
Neo4j Browser Demo Next Steps

10. What is a Graph? What is Neo4j? Data Modeling
Cypher Query
Language
Neo4j Browser Demo Next Steps

11. What is a Graph? What is Neo4j? Data Modeling
Cypher Query
Language
Neo4j Browser Demo Next Steps
language:’Swedish’
open_source:true
year:2007
The Property Graph

12. Neo4j
Recommendations
eHarmony
Glassdoor
Logistics
eBay
shutl
Content
Management
OneFineStay
Lufthansa
Customers
neo4j.com/customers
What is a Graph? What is Neo4j? Data Modeling
Cypher Query
Language
Neo4j Browser Demo Next Steps

13. Data Modeling

14. A Journey from SQL to Graph
What is a Graph? What is Neo4j? Data Modeling
Cypher Query
Language
Neo4j Browser Demo Next Steps

15. Example: YouTube in SQL
ID Name
1 Alice
2 Bob
3 Charles
4 David
What is a Graph? What is Neo4j? Data Modeling
Cypher Query
Language
Neo4j Browser Demo Next Steps
ID Name
1 Bob’s Gaming Channel
2 Bob’s Cute Dog
3 Cooking with Charles
4 David’s How-To Channel
5 Disco Dancing with David
User ID Channel ID
2 1
2 2
3 3
4 4
4 5
USERS
CHANNELS
USERS_CHANNELS
User ID Channel ID
1 3
1 4
2 3
2 5
3 1
USERS_SUBSCRIPTIONS

16. Example: YouTube in a Graph
What is a Graph? What is Neo4j? Data Modeling
Cypher Query
Language
Neo4j Browser Demo Next Steps
name:’Alice’
name:’Bob’
name:’Charles’
name:’David’
name:’Cooking with Charles’
name:’David’s How-To Channel’
name:’Disco Dancing with David’
name:’Bob’s Gaming Channel’
name:’Bob’s Cute Dog’
User
Channel
SUBSCRIBED

17. Cypher Query Language

18. What is a Graph? What is Neo4j? Data Modeling
Cypher Query
Language
Neo4j Browser Demo Next Steps
name:’Alice’
name:’Bob’
name:’Charles’
name:’David’
name:’Cooking with Charles’
name:’David’s How-To Channel’
name:’Disco Dancing with David’
name:’Bob’s Gaming Channel’
name:’Bob’s Cute Dog’
User
Channel
SUBSCRIBED
MATCH (n)
RETURN n;

19. What is a Graph? What is Neo4j? Data Modeling
Cypher Query
Language
Neo4j Browser Demo Next Steps
name:’Alice’
name:’Bob’
name:’Charles’
name:’David’
name:’Cooking with Charles’
name:’David’s How-To Channel’
name:’Disco Dancing with David’
name:’Bob’s Gaming Channel’
name:’Bob’s Cute Dog’
User
Channel
SUBSCRIBED
MATCH (u:User)
RETURN u;

20. What is a Graph? What is Neo4j? Data Modeling
Cypher Query
Language
Neo4j Browser Demo Next Steps
name:’Alice’
name:’Bob’
name:’Charles’
name:’David’
name:’Cooking with Charles’
name:’David’s How-To Channel’
name:’Disco Dancing with David’
name:’Bob’s Gaming Channel’
name:’Bob’s Cute Dog’
User
Channel
SUBSCRIBED
MATCH (c:Channel)
RETURN c;

21. What is a Graph? What is Neo4j? Data Modeling
Cypher Query
Language
Neo4j Browser Demo Next Steps
name:’Alice’
name:’Bob’
name:’Charles’
name:’David’
name:’Cooking with Charles’
name:’David’s How-To Channel’
name:’Disco Dancing with David’
name:’Bob’s Gaming Channel’
name:’Bob’s Cute Dog’
User
Channel
SUBSCRIBED
MATCH (bob:User {name:’Bob’})
RETURN bob;

22. What is a Graph? What is Neo4j? Data Modeling
Cypher Query
Language
Neo4j Browser Demo Next Steps
name:’Alice’
name:’Bob’
name:’Charles’
name:’David’
name:’Cooking with Charles’
name:’David’s How-To Channel’
name:’Disco Dancing with David’
name:’Bob’s Gaming Channel’
name:’Bob’s Cute Dog’
User
Channel
SUBSCRIBED
MATCH (u:User)-[r]->(c:Channel)
RETURN u, r, c;

23. What is a Graph? What is Neo4j? Data Modeling
Cypher Query
Language
Neo4j Browser Demo Next Steps
name:’Alice’
name:’Bob’
name:’Charles’
name:’David’
name:’Cooking with Charles’
name:’David’s How-To Channel’
name:’Disco Dancing with David’
name:’Bob’s Gaming Channel’
name:’Bob’s Cute Dog’
User
Channel
SUBSCRIBED
MATCH (u:User)-[r:OPERATES]->(c:Channel)
RETURN u, r, c;

24. What is a Graph? What is Neo4j? Data Modeling
Cypher Query
Language
Neo4j Browser Demo Next Steps
name:’Alice’
name:’Bob’
name:’Charles’
name:’David’
name:’Cooking with Charles’
name:’David’s How-To Channel’
name:’Disco Dancing with David’
name:’Bob’s Gaming Channel’
name:’Bob’s Cute Dog’
User
Channel
SUBSCRIBED
MATCH p=(:User)-[:OPERATES]->(:Channel)
RETURN p;

25. What is a Graph? What is Neo4j? Data Modeling
Cypher Query
Language
Neo4j Browser Demo Next Steps
name:’Alice’
name:’Bob’
name:’Charles’
name:’David’
name:’Cooking with Charles’
name:’David’s How-To Channel’
name:’Disco Dancing with David’
name:’Bob’s Gaming Channel’
name:’Bob’s Cute Dog’
User
Channel
SUBSCRIBED
MATCH p=(:User {name:’Bob’})-[:OPERATES]->(:Channel)<-[:SUBSCRIBED]-(:User)
RETURN p;

26. What is a Graph? What is Neo4j? Data Modeling
Cypher Query
Language
Neo4j Browser Demo Next Steps
name:’Alice’
name:’Bob’
name:’Charles’
name:’David’
name:’Cooking with Charles’
name:’David’s How-To Channel’
name:’Disco Dancing with David’
name:’Bob’s Gaming Channel’
name:’Bob’s Cute Dog’
User
Channel
SUBSCRIBED
MATCH (u:User)-[r]->(c:Channel)
RETURN u.name, TYPE(r), c.name;

27. What is a Graph? What is Neo4j? Data Modeling
Cypher Query
Language
Neo4j Browser Demo Next Steps
name:’Alice’
name:’Bob’
name:’Charles’
name:’David’
name:’Cooking with Charles’
name:’David’s How-To Channel’
name:’Disco Dancing with David’
name:’Bob’s Gaming Channel’
name:’Bob’s Cute Dog’
User
Channel
SUBSCRIBED
MATCH (:User {name:’Bob’})-[:OPERATES]->(c:Channel)
RETURN COUNT(c);

28. What is a Graph? What is Neo4j? Data Modeling
Cypher Query
Language
Neo4j Browser Demo Next Steps
name:’Alice’
name:’Bob’
name:’Charles’
name:’David’
name:’Cooking with Charles’
name:’David’s How-To Channel’
name:’Disco Dancing with David’
name:’Bob’s Gaming Channel’
name:’Bob’s Cute Dog’
User
Channel
SUBSCRIBED
MATCH (u:User)-[:OPERATES]->(c:Channel)
RETURN u.name, COUNT(c) AS channels
ORDER BY channels DESC;

29. What is a Graph? What is Neo4j? Data Modeling
Cypher Query
Language
Neo4j Browser Demo Next Steps
name:’Alice’
name:’Bob’
name:’Charles’
name:’David’
name:’Cooking with Charles’
name:’David’s How-To Channel’
name:’Disco Dancing with David’
name:’Bob’s Gaming Channel’
name:’Bob’s Cute Dog’
User
Channel
SUBSCRIBED
MATCH p=(:User {name:'Charles'})-[*1..4]-(:User {name:'David'})
RETURN p
LIMIT 1;

30. Uniqueness Constraints
CREATE CONSTRAINT ON (u:User) ASSERT u.name IS UNIQUE;
CREATE CONSTRAINT ON (c:Channel) ASSERT c.name IS UNIQUE;

31. Download the Cypher Refcard
bit.ly/cypher-refcard

32. Neo4j Browser Demo

33. Next Steps

34. Download Neo4j
What is a Graph? What is Neo4j? Data Modeling
Cypher Query
Language
Neo4j Browser Demo Next Steps
neo4j.com

35. Choose a Driver
neo4j.com/contrib
What is a Graph? What is Neo4j? Data Modeling
Cypher Query
Language
Neo4j Browser Demo Next Steps

36. Join the Community
bit.ly/neo4j-google
@neo4j
#neo4j
What is a Graph? What is Neo4j? Data Modeling
Cypher Query
Language
Neo4j Browser Demo Next Steps
neo4j.meetup.com

37. Come to the RNeo4j Meetup
• Tuesday, September 9th, 2014
• 6:00-7:30PM
• In this room
• bit.ly/graphs-r-cool
What is a Graph? What is Neo4j? Data Modeling
Cypher Query
Language
Neo4j Browser Demo Next Steps

38. October 22, 2014
SF Jazz
Innovate. Share. Connect.
Register @ graphconnect.com
Discount for Meetup attendees:
SFLOCAL200