Can you explain the three-schema architecture in English, specifically the three schemas being referred to: internal schema, conceptual schema, and external schema.
Answer (1)
Answer:1. Internal SchemaThis is the lowest level of the database.It describes how the data is physically stored in the computer (files, indexes, storage structures, etc.).Example: The database system knows that a table is stored as a B-tree index or that certain data is compressed.2. Conceptual SchemaThis is the middle level and the most important one.It describes the overall logical structure of the entire database.It defines what data is stored and how the data is related, but not how it is physically stored.Example: A conceptual schema might say the database has tables like Students, Courses, and Enrollments with relationships among them.3. External SchemaThis is the highest level of the database.It describes the way individual users or applications see the data.Different users may need different views depending on their role.Example: A teacher might only see Students and Grades, while an admin might see Students, Personal Info, and Payments.
