Explain the relationship between the three levels of the data definition language. As a user, which level would you be most interested in?
What will be an ideal response?
One level is the schema, which is the conceptual view of the data. The schema describes the entire database and it represents the database logically. The second level is the internal view, which is the physical arrangement of the records. At this level, the data records are described as well as linkages between files. The next level is the subschema, which is the external view of the database that specific users have authorization to use. This is also called the user view and is the level that users find of most interest.
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