Candidate keys A key is known as a candidate key when it has the ability to derive all the attributes from a relation...

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Answer 1

Expert Solution & Answer

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 algorithm

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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Check out a sample textbook solution

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Answer 2

Expert Solution & Answer

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 algorithm

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...

Expert Solution & Answer

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Check out a sample textbook solution

See solution

Answer 3

Expert Solution & Answer

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 algorithm

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...

Expert Solution & Answer

Want to see the full answer?

Check out a sample textbook solution

See solution

Answer 4

Expert Solution & Answer

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 algorithm

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...

Expert Solution & Answer

Want to see the full answer?

Check out a sample textbook solution

See solution

Answer 5

Expert Solution & Answer

Answer 6

Expert Solution & Answer

Answer 7

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 algorithm

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...

Answer 8

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...

Answer 9

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...

Answer 10

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 ...

Answer 11

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 ...

Answer 12

c.

Explanation of Solution

Remaining steps of algorithm

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...

Answer 13

c.

Explanation of Solution

Remaining steps of algorithm

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...

Answer 14

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...

Answer 15

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...

Answer 16

Expert Solution & Answer

Answer 17

Expert Solution & Answer

Answer 18

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Answer 19

Ch. 7 - Prob. 1PE Ch. 7 - Prob. 2PE Ch. 7 - Explain how functional dependencies can be used to...Ch. 7 - Prob. 4PE Ch. 7 - Prob. 5PE Ch. 7 - Prob. 6PE Ch. 7 - Prob. 7PE Ch. 7 - Prob. 8PE Ch. 7 - Prob. 9PE Ch. 7 - Prob. 10PE

Candidate keys A key is known as a candidate key when it has the ability to derive all the attributes from a relation...

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...

Explanation of Solution

Explanation of Solution

Remaining steps of algorithm 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...

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...

Want to see the full answer?

Chapter 7 Solutions

Candidate keys

A key is known as a candidate key when it has the ability to derive all the attributes from a relation...

Remaining steps of algorithm

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...

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...