Which of the following is not an example of a relational database?

Question

BlackTom AI · Accepted Answer

Evaluating the four options, we need to distinguish relational databases from non-relational ones.
Option 1 (MySQL): MySQL is a classic relational database management system that uses structured query language (SQL) and stores data in tables with predefined schemas and relationships. This makes it a textbook relational DBMS.
Option 2 (Oracle): Oracle Database is another prominent relational DBMS known for its advanced SQL capabilities, ACID compliance, and table-based schema organization. It clearly belongs in the relational category.
Option 3 (PostgreSQL): PostgreSQL is a highly respected open-source relational database system that supports complex queries, joins, and rigorous data integrity through schemas and constraints. It is definitively relational.
Option 4 (MongoDB): MongoDB is a document-oriented database categorized as a non-relational (NoSQL) database. It stores data as flexible, JSON-like documents without fixed table schemas and typically emphasizes scalability and schema flexibility over traditional table-based relations.
In summary, options 1–3 are relational databases due to their structured tables, defined schemas, and use of SQL, while option 4 deviates from this model by employing a document-store approach typical of non-relational systems.

Which of the following is not an example of a relational database?单项选择题

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