Which Of The Following Is Not A Relational Database

In my years of experience working with databases, I’ve come to appreciate the power and flexibility of relational databases. However, not all databases fall into the category of being relational, and it’s important to understand the distinctions between them. So, let’s explore the characteristics of relational databases and identify which among the following options is not a relational database.

Relational Databases: A Brief Overview

Relational databases are based on the relational model of data, where data is organized into one or more tables (or “relations”) of rows and columns, with a unique key identifying each row. The structure allows for powerful querying, data manipulation, and data integrity through the use of keys and constraints.


MySQL is an open-source relational database management system (RDBMS) that uses structured query language (SQL). It’s widely used for web applications and has a robust set of features for managing and querying data. With its support for various data types and indexes, MySQL is a popular choice for organizations of all sizes. Due to its adherence to the relational model, MySQL is indeed a relational database.


MongoDB, on the other hand, is a document-oriented NoSQL database. Unlike relational databases, MongoDB stores data in flexible, JSON-like documents. It’s designed to be agile and scalable, making it a go-to choice for applications with rapidly changing data requirements and those needing to handle large volumes of data. However, it’s important to note that MongoDB is not a relational database, as it doesn’t follow the tabular structure and rigid schema of relational models.


PostgreSQL, also known as Postgres, is an open-source object-relational database system that emphasizes extensibility and SQL compliance. It goes beyond the scope of traditional relational databases by supporting complex data types, indexing methods, and powerful features like full-text search and JSON support. Yet, despite its advanced capabilities, PostgreSQL remains true to its relational roots and is indeed a relational database.

The Verdict: MongoDB

After examining the options, it becomes clear that MongoDB is not a relational database. Its document-oriented nature, lack of fixed schema, and focus on scalability set it apart from traditional relational databases like MySQL and PostgreSQL. While MongoDB offers immense value in certain use cases, it’s important to recognize its non-relational nature when considering database choices for specific applications.

In Conclusion

Understanding the nature of various database systems is crucial for making informed decisions in software development and data management. Relational databases like MySQL and PostgreSQL provide a solid foundation for structured data storage and retrieval, while non-relational databases like MongoDB offer flexibility and scalability for specific use cases. By distinguishing between these database types, we can leverage the strengths of each to build robust and efficient systems.