Answer :
A database has one physical schema and one conceptual (logical) schema but many external schemas (views): a. True.
A database refers to a structured (organized) collection of data that are stored on a computer system and usually accessed in various ways such as electronically.
In database management, a database schema can be defined as a structure which is typically used to represent the logical design of the database. Thus, it denotes how data are stored (organized) and the relationships existing in a database management system (DBMS).
Generally, there are two (2) main types of a database schema and these include;
- Physical database schema: it is only one per database.
- Conceptual (logical) schema: it is only one per database.
However, there are multiple number of external schemas (views) for each database because it is what an end user is interested in.
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