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A logical schema

  • A.Is the entire database.
  • B.describe data in terms of relational tables and columns, object-oriented classes, and XML tags.
  • C.Describes how data is actually stored on disk.
  • D.Both (A) and (C)

Answer: A

Correct answer: Is the entire database.

The logical (conceptual) schema is the complete description of the whole database - every table, column, key and constraint - as one community view. It is distinct from the internal schema, which says how the data sits on disk, and from the external schemas or subschemas, each of which shows one application its own slice.

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