Freshers / Beginner level questions
Freshers / Beginner level questions & answers
Ques 1. What is Neo4j?
Neo4j is a graph database management system that is designed for efficient storage and retrieval of graph-structured data.
Ques 2. Explain the basic components of Neo4j.
The basic components of Neo4j include nodes, relationships, and properties. Nodes represent entities, relationships define connections between nodes, and properties store key-value pairs associated with nodes and relationships.
Ques 3. How are relationships represented in Neo4j?
Relationships in Neo4j are represented as typed, directed edges between nodes. They have a type, direction (either outgoing or incoming), and can have properties.
Ques 4. What is an index in Neo4j?
An index in Neo4j is a data structure that allows for faster retrieval of nodes based on certain properties. It helps optimize queries by enabling quick lookup of nodes with specific property values.
Ques 5. What is a transaction in Neo4j?
A transaction in Neo4j is a series of read and write operations executed as a single, atomic unit. Transactions ensure data integrity and consistency in the database.
Ques 6. What is the use of the WITH clause in Cypher?
The WITH clause in Cypher is used to pass the results of one part of a query to another. It helps break down complex queries into simpler, more manageable parts.
Ques 7. How can you import data into Neo4j?
Data can be imported into Neo4j using the LOAD CSV clause in Cypher or by using Neo4j's import tools. The data should be in CSV format for easy import.
Ques 8. Explain the role of the Neo4j Browser in interacting with the database.
The Neo4j Browser is a web-based tool that allows users to interact with the Neo4j database through a user-friendly interface. It supports executing Cypher queries and visualizing graph data.
Ques 9. What is the purpose of the RETURN clause in Cypher?
The RETURN clause in Cypher is used to specify the data to be returned as the result of a query. It allows users to define the structure and content of the query output.
Ques 10. How does Neo4j handle unstructured data in the graph?
Neo4j allows users to store unstructured data as properties of nodes and relationships. These properties can be of various types, including text, numbers, and arrays.
Ques 11. Explain the difference between a directed and an undirected relationship in Neo4j.
A directed relationship in Neo4j has a specific direction, indicating an arrow from one node to another. An undirected relationship has no direction and can be traversed in both directions.
Ques 12. What is the purpose of the DELETE clause in Cypher?
The DELETE clause in Cypher is used to remove nodes, relationships, and properties from the graph. It helps in managing and maintaining the graph data.
Ques 13. What is the purpose of the CASE statement in Cypher?
The CASE statement in Cypher is used to conditionally execute expressions. It allows users to perform different actions based on specified conditions within a query.
Ques 14. What is the significance of the EXISTS clause in Cypher?
The EXISTS clause in Cypher is used to check the existence of a pattern in the graph. It returns true if the specified pattern is found and false otherwise.
Ques 15. What is the purpose of the ORDER BY clause in Cypher?
The ORDER BY clause in Cypher is used to sort the result set of a query based on specified criteria. It allows users to control the order in which the data is returned.
Ques 16. How does Neo4j handle schema in the graph database?
Neo4j is a schema-optional graph database, allowing users to add and modify the structure of the graph dynamically. It provides flexibility in modeling and evolving the graph schema.
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