Neo4j Introduction

introduction_to_neo4j

CHEAT SHEET

1. Database Creation

CREATE DATABASE SampleGraphDatabase

This creates a database named SampleGraphDatabase

2. View data

Currently our database is empty

3. Insert data

Data is stored in Neo4j as nodes. Each node has a label and properties.

Think of labels as identifiers for a node. It tells us what type of node it is.

If you are familiar with SQL, you would know about columns. Properties are similar to columns

Let us create a Person node and give it a property called name.

CREATE (p: Person {name: "Abhinav", userID: 1})

4. Fetch data

Let's fetch the data we just inserted

MATCH (n:Person) RETURN n

Here's the node in detail. As you can see each node columns with an id and elementid property by default.

Think of <id> as the ID field in SQL, we will be using this in a lot of queries.

name is the property we added to that node.

Now that we have a added a node, it will show up under Datatbase Information.

5. Node Relationship

We can create relationships between nodes having different labels.

First, let us create another node.

CREATE (AdminProfile: Profile {created_date: datetime("2024-06-30T18:40:32.142+0100"), userID: 0})

CREATE (ADMIN: Person{name: "Admin User"})

Now let us create a relationship called IsOwnerOf

MATCH (a:Person),
(b:Profile)
WHERE a.userID = b.userID
CREATE (a)-[:IsOwnerOf]->(b);

Now we have established a relationship between Profile and Person nodes based on their shared userID .

6. Fetch data with filters

We can filter our query results with a WHERE clause

MATCH (n) WHERE n.userID = 1 RETURN n

As you can see these nodes have a relation between them.

Here's the entire database