What is the difference between a database and a database management system? MCQ with Answer and Explanation

Explanation:
In SQL pattern matching with the LIKE operator, the underscore (*) represents exactly one single character, while the percent sign (%) matches zero or more characters.

Explanation:
Constraints are used to enforce rules on data, such as NOT NULL, UNIQUE, PRIMARY KEY, FOREIGN KEY, and CHECK.

Explanation:
Physical Data Independence is the ability to modify the physical schema (like storage devices or file structures) without changing the conceptual or external schemas.