Topic: Database Management Systems
Which of the following is a characteristic of NoSQL databases?
- A. They enforce a strict schema
- B. They support only relational data model
- C. They are queried using SQL
- D. They support flexible schema
Answer: D. They support flexible schema
Explanation: NoSQL (Not Only SQL) databases are designed to handle unstructured or semi-structured data. Unlike traditional relational databases that require a predefined, rigid schema, NoSQL databases support dynamic and flexible schemas, allowing fields to be added on the fly.