B: Relational vs. NoSQL data relationships:
* Relational Databases:Useforeign keysto establish relationships between tables, maintaining referential integrity.
* NoSQL Databases:Typically do not enforce relationships through foreign keys. Instead, they:
* Embed related datawithin a single document (common in document stores like MongoDB).
* Useapplication-level joinsto link related data (common in key-value or column-family stores).
* Graph databases (a type of NoSQL) useedgesto explicitly represent relationships between nodes.
* This difference highlights theflexibility vs. consistencytrade-off between NoSQL and relational databases.
Why the other options are incorrect:
* A. NoSQL databases lack relationships:Incorrect; they handle relationships differently.
* C. NoSQL using foreign keys exclusively:NoSQL databases generally do not enforce such relationships.
* D. Relational databases lack relationship mechanisms:Incorrect as relational databases are designed around relationships.