Graph databases are well-suited for storing and querying multi-relational data. They provide better performance, flexibility, and agility than relational databases for such data. Tests showed graph databases like Neo4j outperforming relational databases by returning results faster and for more records as depth and complexity of queries increased. Cypher is the query language for Neo4j that allows starting queries, matching patterns, returning and filtering results through clauses like START, MATCH, RETURN, and WHERE. Graph databases are used successfully by many large companies needing to handle complex relationships in data.

1. Graph Database
By
Hardik Jain
Developer
Allerin Tech Pvt Ltd

2. What is Graph Database ?
Why Graph Database ?

3. Graph Database

4. Power of Graph Databases
● Performance
● Flexibility
● Agility

5. Performance comparison
Depth RDBMS Execution time Neo4j execution time Records returned
2 0.016 0.01 ~2500
3 30.267 0.168 ~110,000
4 1543.505 1.359 ~600,000
5 Unfinished 2.132 ~800,000

6. Relational database is not good for
relationship data - join

7. Cypher Query
Cypher query clauses
● START
● MATCH
● RETURN
● WHERE
● CREATE
● DELETE
● SET
● UNION

8. ● Beginning a Query
START clause is used to begin a cypher query
● Declaring Information Patterns to Find
START english = node:language(name = ‘English’)
berlin = node:city(name = ‘Berlin’)
korth = node:author(name = 'korth')
MATCH () - [:KNOWS] - > (english) - [:LIVES_IN] -> (berlin) - [:read] ->(book) -
[:wrritten_by]- > (korth)
RETURN book.title AS title

9. ● Constraining Matches
For constraint matching WHERE clause is used
● Processing Results
The RETURN clause in cypher is used to return the query results.
START english = node:language(name = ‘English’)
berlin = node:city(name = ‘Berlin’)
korth = node:author(name = 'korth')
MATCH () - [:KNOWS] - > (english) - [:LIVES_IN] -> (berlin) - [:read] -> (book) -
[:wrritten_by]- > (korth)
WHERE book.publication_year > 2000
RETURN book.title AS title

10. Conclusion
● It is best suited for multi relation applications.
● Used by following companies.
● Gartner
● eBay
● Walmart
● telenor ..etc

11. Thank You!