Discussion
In a relation
Answer: C
Correct answer: (A) and (B) both are true
A relation is a set of tuples, and two things follow from that. The order of the rows carries no meaning, so a query must sort explicitly if it wants a particular order; and no two rows can be identical, since a set has no duplicates. (SQL tables relax the second rule unless a key or DISTINCT enforces it.)
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