Neo4j is an open-source, schema-free graph database written in Java. It uses the Cypher query language to create, retrieve, update and delete data stored in graph structures. Cypher provides a simple syntax for defining patterns to match graph structures and retrieve or modify data. Common Cypher clauses include CREATE, MATCH, RETURN, WHERE, DELETE, and SET. Neo4j is used by many global companies and startups to power innovative solutions by modeling and querying connected data.

1. Introduction to Neo4j
World’s Leading Graph Database

2. What is Neo4j:
Neo4j is -
An open source
Schema-free
No SQL
Graph Database

3. Developer(s) Neo Technology
Initial release 2007; 9 years ago
Stable release 3.0.1 / May 6, 2016; 53 days ago
Written in Java
Operating system Cross-platform
Type Graph database
Website neo4j.com
https://en.wikipedia.org/wiki/Neo4j

4. Cypher Query Language:
CQL Stands for Cypher Query Language. Like Oracle Database has query language SQL, Neo4j has CQL as query language.
Neo4j CQL -
It is a query language for Neo4j Graph Database.
It is a declarative pattern-matching language.
It follows SQL like syntax.
It is syntax is very simple and human readable format.
Like Oracle SQL -
Neo4j CQL has commands to perform Database operations.
Neo4j CQL supports many clauses like WHERE, ORDER BY etc., to write very complex queries in very easy manner.
Neo4j CQL supports some functions like String, Aggregation.In addition to them, it also supports some Relationship Functions.

5. CQL
Command/Clause:
CREATE
MATCH
RETURN
WHERE
DELETE
SET

6. CQL
Command/Clause:
CREATE
MATCH
RETURN
WHERE
DELETE
SET

7. CREATE clause:
Step 1 - Open Neo4j Data
Browser
Step 2 -Type the below command at
dollar prompt in Data Browser.
CREATE (emp:Employee)
Step 3 -Click on Execute button and see
the success message in the Data
Browser.

8. CREATE clause:
Step 1 - Open Neo4j Data Browser
Step 2 -Type the below command
at dollar prompt in Data Browser.
CREATE (emp:Employee)
Step 3 -Click on Execute button and see
the success message in the Data
Browser.

9. CREATE clause:
Step 1 - Open Neo4j Data Browser.
Step 2 -Type the below command at
dollar prompt in Data Browser.
CREATE (emp:Employee)
Step 3 -Click on Execute button
and see the success message in the Data
Browser.

10. CREATE clause:
CREATE A Node With
Properties:
Step 1 -Type the below command
at dollar prompt in Data
Browser.
CREATE (
<node-name>:<label-name>
{
<Property1-name>:<Property1-Value>
........
<Propertyn-name>:<Propertyn-Value>
}
)
Step 2 -Click on Execute button and see
the success message in the Data

11. CREATE clause:
CREATE A Node with
Properties:
Step 1 -Type the below command at
dollar prompt in Data Browser.
CREATE (
<node-name>:<label-name>
{
<Property1-name>:<Property1-Value>
........
<Propertyn-name>:<Propertyn-Value>
}
)
Step 2 -Click on Execute button
and see the success message in the Data
Browser.

12. CQL
Command/Clause:
CREATE
MATCH
RETURN
WHERE
DELETE
SET

13. MATCH and RETURN clause:
Step 1 - Type the below command at
dollar prompt in Data Browser.
MATCH
(
<node-name>:<label-name>
)
RETURN
<node-name>.<property1-name>,
...
<node-name>.<propertyn-name>
Step 2 - Click on Execute button and see the
success message in the Data Browser.

14. MATCH and RETURN clause:
Step 1 - Type the below command at
dollar prompt in Data Browser.
MATCH
(
<node-name>:<label-name>
)
RETURN
<node-name>.<property1-name>,
...
<node-name>.<propertyn-name>
Step 2 - Click on Execute button and
see the success message in the Data
Browser.

15. MATCH and RETURN clause:
To retrieve all
properties(deptno,dname,location)
data of Dept Node from Database:
MATCH (dept: Dept)
RETURN
dept.deptno,dept.dname,dept.location

16. MATCH and RETURN clause:
To retrieve all
properties(deptno,dname,location)
data of Dept Node from Database:
MATCH (dept: Dept)
RETURN
dept.deptno,dept.dname,dept.location
CLick on Execute button.

17. CQL
Command/Clause:
CREATE
MATCH
RETURN
WHERE
DELETE
SET

18. WHERE clause:
MATCH (emp:Employee)
RETURN emp.empid,emp.name,emp.salary,emp.deptno

19. WHERE clause:
MATCH (emp:Employee)
RETURN emp.empid,emp.name,emp.salary,emp.deptno
Click on "Execute" button and observe
the results.

20. WHERE clause:
MATCH (emp:Employee) WHERE emp.name = 'Abc’
RETURN emp.empid,emp.name,emp.salary,emp.deptno

21. WHERE clause:
MATCH (emp:Employee) WHERE emp.name = 'Abc’
RETURN emp.empid,emp.name,emp.salary,emp.deptno
Click on "Execute" button and
observe the results.

22. Relationship Basics

23. Relationships:
CREATE (e:Customer{id:"1001",name:"Abc",dob:"01/10/1982"})

24. Relationships:
CREATE (e:Customer{id:"1001",name:"Abc",dob:"01/10/1982"})
CREATE (cc:CreditCard{id:"5001",number:"1234567890",cvv:"888",expiredate:"20/17"})

25. Relationships:
CREATE (e:Customer{id:"1001",name:"Abc",dob:"01/10/1982"})
CREATE (cc:CreditCard{id:"5001",number:"1234567890",cvv:"888",expiredate:"20/17"})
MATCH (cust:Customer),(cc:CreditCard)
CREATE (cust)-[r:DO_SHOPPING_WITH{shopdate:"12/12/2014",price:55000}]->(cc)
RETURN r

26. Relationships:
MATCH (cust:Customer),(cc:CreditCard)
CREATE (cust)-[r:DO_SHOPPING_WITH{shopdate:"12/12/2014",price:55000}]->(cc)
RETURN r
Click on "Execute"
button

27. Relationships:
MATCH (cust:Customer),(cc:CreditCard)
CREATE (cust)-[r:DO_SHOPPING_WITH{shopdate:"12/12/2014",price:55000}]->(cc)
RETURN r
Click on Relationship arrow
mark to view its properties.

28. CQL
Command/Clause:
CREATE
MATCH
RETURN
WHERE
DELETE
SET

29. DELETE clause:
MATCH (cc: CreditCard)-[rel]-(c:Customer)
DELETE cc,c,rel

30. DELETE clause:
MATCH (cc: CreditCard)-[rel]-(c:Customer)
DELETE cc,c,rel
Click on "Execute" button and
observe the results.

31. CQL
Command/Clause:
CREATE
MATCH
RETURN
WHERE
DELETE
SET

32. SET clause:
<node-label-name>.<property1-name>,
<node-label-name>.<property2-name>,
....
<node-label-name>.<propertyn-name>

33. SET clause:
<node-label-name>.<property1-name>,
<node-label-name>.<property2-name>,
....
<node-label-name>.<propertyn-name>
MATCH (dc:DebitCard)
SET dc.atm_pin = 3456
RETURN dc

34. SET clause:
<node-label-name>.<property1-name>,
<node-label-name>.<property2-name>,
....
<node-label-name>.<propertyn-name>
MATCH (dc:DebitCard)
SET dc.atm_pin = 3456
RETURN dc

35. SET clause:
<node-label-name>.<property1-name>,
<node-label-name>.<property2-name>,
....
<node-label-name>.<propertyn-name>
MATCH (dc:DebitCard)
SET dc.atm_pin = 3456
RETURN dc
Click on "Execute" button and
observe the results.

36. Who’s using Neo4j??
From Global 500 companies to startups,
Neo4j Powers Innovative Solutions Across
a Wide Range of Industries.
http://neo4j.com/customers

37. http://neo4j.com/customers

38. Thank
You!
I hope this introduction will be helpful for you
to learn Neo4j.
For more information about neo4j, go to
Neo4j.com