Database System Concepts
7th Edition
ISBN: 9789332901384
Author: Henry F. Korth & S. Sudarshan Abraham Silberschatz
Publisher: MCGRAW-HILL HIGHER EDUCATION
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Chapter 7, Problem 33E
a.
Explanation of Solution
Candidate keys
- A key is known as a candidate key when it has the ability to derive all the attributes from a relation...
b.
Explanation of Solution
Canonical cover for F
- The steps for canonical conversion is to break the functional dependencies so that right hand side will have only one single attribute.
- Then all the extra unnecessary functional dependencies are removed.
- Then all the functional dependencies are combined.
- Hence here the given functional dependencies include AB -> G, AB -> D ...
c.
Explanation of Solution
Remaining steps of
- The given relation is in 1NF as there is no multivalued attribute or complex attribute.
- The given relation is not in 2NF as there is partial functional dependency...
d.
Explanation of Solution
Final decomposition
- Given functional dependencies are AB -> CD, ADE -> GDE, B -> GC, G -> DE.
- Here ADE -> GDE have some trivial attributes.
- So those attributes can be removed and hence the dependency is ADE -> G...
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Chapter 7 Solutions
Database System Concepts
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