Introduction to Database System
Which of the following is not a restriction for a table to be a relation?

All of the entries in any column must be of the same kind.
No two rows in a table may be identical.
The columns must be ordered.
The cells of the table must contain a single value.

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Introduction to Database System
A logical schema

None of these
is a standard way of organizing information into accessible parts
All of these
describes how data is actually stored on disk
is the entire database

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