¬ P1 ∨ P2
P1 ∨ P2
P1 ∧ P2
P1 ∧ ¬P2
Is the entire database.
describe data in terms of relational tables and columns, object-oriented classes, and XML tags.
Describes how data is actually stored on disk.
Both (A) and (C)
Data file
Data record.
Menu.
Bank.
Users.
Separate files
Database.
Database administrator
Module.
Relational model.
Schema.
Sub schema.