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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?

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Cypher
A pattern matching query language made for graphs
• Declarative
• Expressive
• Pattern-Matching

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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

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Visualization
Queries
Processing
Storage
Non-Native Graph DB
Native Graph DB RDBMS
Optimized for graph
workloads
Native vs Non-Native

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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)