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.
The cells of the table must contain a single value.
No two rows in a table may be identical.
The columns must be ordered.

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Introduction to Database System
A good query system

both (a) and (b)
None of these
can accept English language commands
can be accessed only by data processing professionals
allows non-programmers to access information stored in a database

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