![© 2023 Neo4j, Inc. All rights reserved.
Cypher: powerful and expressive query language
:LOVES
CREATE (:Person {name: 'Jane'})
NODE
Label Property
NODE
Label Property
RELATIONSHIP
-[:LOVES]-> (:Person { name: 'Arlo' })
name: 'Jane' name: 'Arlo'
Person Person](https://image.slidesharecdn.com/introductiontographdatabases-230922161549-2d65a621/75/introduction-to-graph-databasespdf-7-2048.jpg?cb=1695399709)
![© 2023 Neo4j, Inc. All rights reserved.
Cypher: powerful and expressive query language
:MARRIED_TO
MATCH (p:Person {name: 'Jane'})
NODE
Label Property
NODE
Variable
RELATIONSHIP
-[:MARRIED_TO]-> (spouse:Person)
name: 'Jane'
Variable
RETURN p, spouse
Label
Person Person](https://image.slidesharecdn.com/introductiontographdatabases-230922161549-2d65a621/75/introduction-to-graph-databasespdf-8-2048.jpg?cb=1695399709)
Introduction to Graph Databases.pdf
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"Introduction to Graph Databases", beginner level, presented at the Neo4j booth at Big Data London 2023
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Introduction to Graph Databases.pdf
- 1. © 2023 Neo4j, Inc. All rights reserved. © 2023 Neo4j, Inc. All rights reserved. Introduction to Graph Databases
- 2. © 2023 Neo4j, Inc. All rights reserved. © 2023 Neo4j, Inc. All rights reserved. Graph Components
- 3. © 2023 Neo4j, Inc. All rights reserved. Graph components Node (Vertex) • The main data element from which graphs are constructed Relationship (Edge) • A link between two nodes. Has: • Direction • Type • A node without relationships is permitted. A relationship without nodes is not ACTED_IN Keanu Reeves The Matrix
- 4. © 2023 Neo4j, Inc. All rights reserved. Property graph database Node (Vertex) Relationship (Edge) Label ● Define node role (optional) ● Can have more than one Properties ● Enrich a node or relationship ● No need for nulls! name: Keanu Reeves title: The Matrix released: 1999 tagline: Welcome… role: Neo Person Action Movie ACTED_IN
- 5. © 2023 Neo4j, Inc. All rights reserved. © 2023 Neo4j, Inc. All rights reserved. How do we query?
- 6. © 2023 Neo4j, Inc. All rights reserved. 6 Cypher A pattern matching query language made for graphs • Declarative • Expressive • Pattern-Matching
- 7. © 2023 Neo4j, Inc. All rights reserved. Cypher: powerful and expressive query language :LOVES CREATE (:Person {name: 'Jane'}) NODE Label Property NODE Label Property RELATIONSHIP -[:LOVES]-> (:Person { name: 'Arlo' }) name: 'Jane' name: 'Arlo' Person Person
- 8. © 2023 Neo4j, Inc. All rights reserved. Cypher: powerful and expressive query language :MARRIED_TO MATCH (p:Person {name: 'Jane'}) NODE Label Property NODE Variable RELATIONSHIP -[:MARRIED_TO]-> (spouse:Person) name: 'Jane' Variable RETURN p, spouse Label Person Person
- 9. © 2023 Neo4j, Inc. All rights reserved. © 2023 Neo4j, Inc. All rights reserved. Index Free Adjacency Or Native vs Non-Native
- 10. © 2023 Neo4j, Inc. All rights reserved. Visualization Queries Processing Storage Non-Native Graph DB Native Graph DB RDBMS Optimized for graph workloads Native vs Non-Native
- 11. © 2023 Neo4j, Inc. All rights reserved. Index-Free Adjacency? Person Person_Knows Look up Person A B C A B C A … … … … … Look up Person in Person_Knows Look up People who were known! (* number of people) 4 Index Lookups Look up Person A C B Chase pointers (No index lookup!) 1 Index Lookup (no matter HOW many friends)