What is a foreign key in a database table? MCQ with Answer and Explanation

Explanation:
Data independence is the capacity to change the database schema at one level without affecting the next higher level, minimizing impact on applications.

Explanation:
ALTER TABLE is a DDL command used to add, delete, or modify columns and constraints in an existing table.

Explanation:
Executing a COMMIT statement instructs the database engine to save all data updates performed during the transaction permanently into physical storage.