What is Neo4j? Why it is used? What is graph Database? Neo4j - 1

• This will be a series of article's , #1 of Neo4j series

Q.What is a graph DB?

• Database that uses graph structures for semantic queries with nodes, edges and properties to store data! Can perform CRUD operations too..

Cypher Query language

• Neo4j provides a powerful declarative query language known as Cypher, to represent the graph visually.
  The commands of this language are in human readable format

• Cypher is easy to learn and can be used to create and retrieve relations between data without using the complex queries like Joins.

• Support's two kinds of Java API:

  • Cypher API and

  • Native Java API to develop Java applications.
    
    

    RDBMS -> Graph Database
    Tables -> Graphs
    Rows -> Nodes
    Columns and Data -> Properties and its values
    Constraints -> Relationships
    Joins -> Traversal

Neo4j Graph Database has the following building blocks
-> Nodes - represents entities or items (users, accounts..)
-> Edges - Lines that connect nodes to other nodes or nodes to properties (Graphs or relationships)
-> Properties - or Attributes which hold the info related to nodes
-> Relationships
-> Labels
-> Data Browser

properties are represented in the circle / rectangle area and the relationship is represented using the lines between the properties