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The Relational Model and Normalization - Technical MCQs

Q1:

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

A The cells of the table must contain a single value.

B All of the entries in any column must be of the same kind.

C The columns must be ordered.

D No two rows in a table may be identical.

ANS:C - The columns must be ordered.

Answer C is correct because question is Which of the following is not a restriction for a table to be a relation? (noticed that "not a restriction for a table").