SQL Roadmap from Zero to Advance

This quiz helps you compare NoSQL vs SQL database features, use-cases, and differences through real-world questions.

SQL vs NoSQL Database Test

In a distributed system, network partitions are inevitable. According to the CAP theorem, which types of systems prioritize Consistency and Partition Tolerance (CP), and are willing to sacrifice Availability?

This model is typically used in systems like banking, where correctness is more important than availability.

In PostgreSQL, how do you switch to another database using CLI?
This is a common need when managing multiple environments.

When designing a document store like MongoDB, embedding vs referencing is a key decision.
What is the primary drawback of embedding deeply nested documents?

In the CAP theorem, what does “A” stand for?

When storing user profiles with flexible schema

When enforcing strict schema and relationships

Which scenario best fits using a traditional RDBMS over NoSQL?

CAP Theorem states that a distributed database can only guarantee two of three properties: Consistency, Availability, and Partition Tolerance.
If a network partition occurs, what trade-off is made in an AP system?

Which of the following is a key-value NoSQL database?

Graph databases like Neo4j are ideal when entities are heavily interconnected.
In which scenario would a graph database be most appropriate?

Chat application storing messages per user

Real-time analytics on time-series sensor data

Social media posts with embedded comments

In NoSQL, document stores like MongoDB store data in JSON-like structures, while column stores like Cassandra organize data by columns for fast aggregation.
Which of the following use cases is best suited for a columnar NoSQL database?

Joins are expensive in distributed systems

In relational databases like MySQL/Postgres, JOINs are commonly used to combine data from multiple tables. In contrast, NoSQL databases often denormalize data to avoid joins.
Which of the following is a key reason for this?

You’re designing a real-time clickstream logging system for millions of users. Which of the following NoSQL types would be the most optimal choice for this write-heavy and append-only data workload?

You are using PostgreSQL and accidentally ran a long SELECT query.
Which keyboard shortcut will help you cancel the running query in CLI?

Which command is used in MySQL/Postgres CLI to view all databases?

In SQL databases, schema is strictly defined and enforced before inserting data, while NoSQL often allows schema flexibility at the document level.
Which advantage does this flexibility offer in real-world systems?