Which database management system (DBMS) is known for its open-source nature and use of SQL?Microsoft AccessOracle DatabaseMongoDBPostgreSQL

To determine which database management system (DBMS) is known for its open-source nature and use of SQL, let's analyze the options provided:

1. Microsoft Access: This is a desktop relational database management system from Microsoft. While it supports SQL, it is not open-source.

2. Oracle Database: A flagship database product that is widely used, especially for enterprise applications. However, Oracle Database is not open-source; it requires a commercial license.

3. MongoDB: This is a NoSQL database that uses a different data model (document-oriented). It is also considered open-source but does not primarily use SQL for querying its data.

4. PostgreSQL: This is an open-source relational database management system that uses SQL. It is highly regarded for its robustness, extensibility, and compliance with SQL standards.

Given the analysis:

Final Answer

PostgreSQL is the DBMS known for its open-source nature and use of SQL.