Discussion
Which of the following is a group of one or more attributes that uniquely identifies a row?
Answer: A
Correct answer: Key
A key is one or more attributes whose values uniquely identify a row. A determinant is the left-hand side of a functional dependency and need not be unique - every key is a determinant, but not every determinant is a key, and that asymmetry is exactly what Boyce-Codd Normal Form addresses. A tuple is a row and a relation a table.
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