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Posts: 122
2 months ago
Explain the relationships among primary keys and functional dependencies.
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Database Processing: Fundamentals, Design, and Implementation
Edition: 15th
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2 months ago
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Relations store instances of functional dependencies in their rows. All primary keys represent a functional dependency, since each primary key functionally determines the entire row. Since the primary key determines the entire row, if a primary key were duplicated in a relation, then the entire row would have to be duplicated. Since a relation can contain no duplicate rows, the primary key must be unique.
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2 months ago
Exactly what I needed for my project, TYSM
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