Introduction to Graphs and Neo4j

Intro to neo4j

Transcript

1. Welcome to NEO4J - Week 1 of 3 - Intro to Graphs Grab a drink/snack and say hi to your neighbour! Wifi: neo4j / GraphConnectLondon If you’ve got a laptop download neo4j from neo4j.com/download
2. Intro to Graphs Praveena Fernandes Mark Needham
3. If you want to tweet... @codingweek @womenwhocode #neo4j
4. 3 part series
5. Neo4j Graph databases & neo4j - have heard the terms, but don't really know what they're about. Learn about use cases of Neo4j, how is working with it, architecture, etc. The potential of neo4j Graph database How to create some Graphs with Neo4j Databases and how they can be used. Neo4J Graph Database and Document Databases Neo4 in practice How to use graph databases practically. About graph databases, how and where are they used in industries (use cases, real life scenarios etc.), how are they different from other types of databases, and how to create them. Applications of graph databases and how to structure them New skills and using graph databases in practice Visualisation More about databases and translating that into visual data (aka graphs) Data viz Your expectations
6. What is a database? database ˈdeɪtəbeɪs/ noun a structured set of data held in a computer, especially one that is accessible in various ways. Ex:"a database covering nine million workers" An example of a database is where A-Level results are stored before they are printed out and published to students.
7. Evolution of Databases • Unit Records and Punch Cards • File Systems • Hierarchical DBMS • Network DBMS • Relational Databases • Object Oriented Databases • NoSQL Source: http://avant.org/project/history-of-databases/
9. What’s a graph database? Simply put, a graph consists of nodes connected by relationships. Graph databases store data as graph structures (nodes and relationships)
10. Neo4j Fundamentals • Nodes • Relationships • Properties • Labels
11. CAR Property Graph Model Components Nodes • Represent the objects in the graph • Can be labeled PERSON PERSON
12. CAR DRIVES Property Graph Model Components Nodes • Represent the objects in the graph • Can be labeled Relationships • Relate nodes by type and direction LOVES LOVES LIVES WITH OW NS PERSON PERSON
13. CAR DRIVES name: “Dan” born: May 29, 1970 twitter: “@dan” name: “Ann” born: Dec 5, 1975 since: Jan 10, 2011 brand: “Volvo” model: “V70” Property Graph Model Components Nodes • Represent the objects in the graph • Can be labeled Relationships • Relate nodes by type and direction Properties • Name-value pairs that can go on nodes and relationships. LOVES LOVES LIVES WITH OW NS PERSON PERSON
14. Graphs are all around us Can you identify nodes and relationships in the room?
15. Summary of the graph building blocks • Nodes - Entities and complex value types • Relationships - Connect entities and structure domain • Properties - Entity attributes, relationship qualities, metadata • Labels - Group nodes by role
16. Cypher: Graph Query Language MATCH (:Person { name:"Dan"} ) -[:LOVES]-> (:Person { name:"Ann"} ) LOVES Dan Ann LABEL PROPERTY NODE NODE LABEL PROPERTY
17. Let's get started With ASCII ART ¯\_(ツ)_/¯
18. Nodes () or (n) • Surrounded with parentheses • Use an alias n to refer to our node later in the query
19. Nodes () or (n) • Surrounded with parentheses • Use an alias n to refer to our node later in the query (n:Label) • Specify a Label, starting with a colon : • Used to group nodes by roles or types (similar to tags)
20. Nodes () or (n) • Surrounded with parentheses • Use an alias n to refer to our node later in the query (n:Label) • Specify a Label, starting with a colon : • Used to group nodes by roles or types (similar to tags) (n:Label {prop: 'value'}) • Nodes can have properties
21. --> or -[r:TYPE]-> • Wrapped with hyphens & square brackets • A relationship type starts with a colon : Relationships
22. --> or -[r:TYPE]-> • Wrapped with hyphens & square brackets • A relationship type starts with a colon : < > Specify the direction of the relationship -[:KNOWS {since: 2010}]-> • Relationships can have properties too! Relationships
23. • Used to query data (n:Label {prop:'value'})-[:TYPE]->(m:Label) Patterns
24. • Can you translate this pattern? (p1:Person {name:'Alice'})-[:KNOWS]->(p2:Person {name:'Bob') Patterns
25. • Find Alice who knows Bob • In other words: • find Person named 'Alice' • who KNOWS • a Person named 'Bob' (p1:Person {name:'Alice'})-[:KNOWS]->(p2:Person {name:'Bob') Patterns
26. Navigate to neo4j.com/download Installing Neo4j
27. Once you download, For setup you will be asked to give a default location. Click start! You are good to go. Goto Browser type http://localhost:7474 Enter default password: neo4j Instructions
28. Type :play movies into the query bar: Play along with the movies graph
29. Type :play movies into the query bar: Play along with the movies graph
30. Sample Queries to try out // Find the Matrix MATCH (movie:Movie {title:"The Matrix"}) RETURN movie // Find the people who acted in any movie and return their name and // the role they played in the movie MATCH (actor:Person)-[rel:ACTED_IN]->(movie:Movie) RETURN rel.roles, actor.name
31. How Customers Use Neo4j Network & Data Center Master Data Management Social Recommendations Identity & Access Search & Discovery GEO
32. Neo4j ✓Graph databases & neo4j - have heard the terms, but don't really know what they're about. ✓Learn about use cases of Neo4j, how is working with it, architecture, etc. The potential of neo4j ✓Graph database ✓How to create some Graphs with Neo4j ✓Databases and how they can be used. Neo4J Graph Database and Document Databases Neo4 in practice How to use graph databases practically. ✓About graph databases, how and where are they used in industries (use cases, real life scenarios etc.), how are they different from other types of databases, and how to create them. Applications of graph databases and how to structure them New skills and using graph databases in practice Visualisation ✓More about databases and translating that into visual data (aka graphs) Data viz Your expectations
33. Thank you :) Contact us: @markhneedham @praveenasekhar Feedback here -> bit.ly/wwc-neo4j Join neo4j.com/slack - we’ll be using it next week
34. Resources • Online Training - https://neo4j.com/online_training/graphdatabases • Graph Databases Book - http://graphdatabases.com/ • Meetup group - https://www.meetup.com/graphdb-london/ • Slack channel - http://neo4j.com/slack • Stack Overflow - http://stackoverflow.com/tags/neo4j