Schemas exist at the external and conceptual levels, but not at the internal level.

Question

Quizplus · Accepted Answer

Schemas exist at all three levels of the three-level schema architecture. The external schema defines how the entire database appears to certain users who are interested in some particular aspect of the data. The conceptual schema defines the underlying logical structure of the entire database, including its relationships and constraints. The internal schema describes the physical representation of the database on the computer. Hence, schemas do exist at the internal level.

Schemas Exist at the External and Conceptual Levels, but Not