Primary key and foreign key constraint: The given functional dependency (FD) which is used to decompose the given relational schema r into r1 and r2 is considered: Considering the decomposed relation r1 and r2:

Question

Want to see the full answer?

Answer 1

Expert Solution & Answer

Chapter 7, Problem 11PE

Explanation of Solution

Primary key and foreign key constraint:

The given functional dependency (FD) which is used to decompose the given relational schema r into r1 and r2 is considered:

Considering the decomposed relation r1 and r2:

Explanation of Solution

Inconsistency that could arise:

When the foreign key constraint is not enforced on the relation r1 and r2 the following inconsistency may arise:

Consider a record is deleted from the relation r1; the referenced record that is obtained from the relation r2 will also be automatically deleted...

Explanation of Solution

Primary key and foreign key constraint:

Refer to the figure 7.19, which decomposes a relation into third normal form (3NF).

According to the above algorithm, make every α the primary key of a schema ri(αβ) that gets added to the schema according to the rule α→β

Expert Solution & Answer

Want to see the full answer?

Check out a sample textbook solution

See solution

Answer 2

Expert Solution & Answer

Chapter 7, Problem 11PE

Explanation of Solution

Primary key and foreign key constraint:

The given functional dependency (FD) which is used to decompose the given relational schema r into r1 and r2 is considered:

Considering the decomposed relation r1 and r2:

Explanation of Solution

Inconsistency that could arise:

When the foreign key constraint is not enforced on the relation r1 and r2 the following inconsistency may arise:

Consider a record is deleted from the relation r1; the referenced record that is obtained from the relation r2 will also be automatically deleted...

Explanation of Solution

Primary key and foreign key constraint:

Refer to the figure 7.19, which decomposes a relation into third normal form (3NF).

According to the above algorithm, make every α the primary key of a schema ri(αβ) that gets added to the schema according to the rule α→β

Expert Solution & Answer

Want to see the full answer?

Check out a sample textbook solution

See solution

Answer 3

Expert Solution & Answer

Chapter 7, Problem 11PE

Explanation of Solution

Primary key and foreign key constraint:

The given functional dependency (FD) which is used to decompose the given relational schema r into r1 and r2 is considered:

Considering the decomposed relation r1 and r2:

Explanation of Solution

Inconsistency that could arise:

When the foreign key constraint is not enforced on the relation r1 and r2 the following inconsistency may arise:

Consider a record is deleted from the relation r1; the referenced record that is obtained from the relation r2 will also be automatically deleted...

Explanation of Solution

Primary key and foreign key constraint:

Refer to the figure 7.19, which decomposes a relation into third normal form (3NF).

According to the above algorithm, make every α the primary key of a schema ri(αβ) that gets added to the schema according to the rule α→β

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 11PE

Explanation of Solution

Primary key and foreign key constraint:

The given functional dependency (FD) which is used to decompose the given relational schema r into r1 and r2 is considered:

Considering the decomposed relation r1 and r2:

Explanation of Solution

Inconsistency that could arise:

When the foreign key constraint is not enforced on the relation r1 and r2 the following inconsistency may arise:

Consider a record is deleted from the relation r1; the referenced record that is obtained from the relation r2 will also be automatically deleted...

Explanation of Solution

Primary key and foreign key constraint:

Refer to the figure 7.19, which decomposes a relation into third normal form (3NF).

According to the above algorithm, make every α the primary key of a schema ri(αβ) that gets added to the schema according to the rule α→β

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 11PE

Explanation of Solution

Primary key and foreign key constraint:

The given functional dependency (FD) which is used to decompose the given relational schema r into r1 and r2 is considered:

Considering the decomposed relation r1 and r2:

Explanation of Solution

Inconsistency that could arise:

When the foreign key constraint is not enforced on the relation r1 and r2 the following inconsistency may arise:

Consider a record is deleted from the relation r1; the referenced record that is obtained from the relation r2 will also be automatically deleted...

Explanation of Solution

Primary key and foreign key constraint:

Refer to the figure 7.19, which decomposes a relation into third normal form (3NF).

According to the above algorithm, make every α the primary key of a schema ri(αβ) that gets added to the schema according to the rule α→β

Answer 8

Chapter 7, Problem 11PE

Explanation of Solution

Primary key and foreign key constraint:

The given functional dependency (FD) which is used to decompose the given relational schema r into r1 and r2 is considered:

Considering the decomposed relation r1 and r2:

Answer 9

Chapter 7, Problem 11PE

Explanation of Solution

Primary key and foreign key constraint:

The given functional dependency (FD) which is used to decompose the given relational schema r into r1 and r2 is considered:

Considering the decomposed relation r1 and r2:

Answer 10

Explanation of Solution

Inconsistency that could arise:

When the foreign key constraint is not enforced on the relation r1 and r2 the following inconsistency may arise:

Consider a record is deleted from the relation r1; the referenced record that is obtained from the relation r2 will also be automatically deleted...

Answer 11

Explanation of Solution

Inconsistency that could arise:

When the foreign key constraint is not enforced on the relation r1 and r2 the following inconsistency may arise:

Consider a record is deleted from the relation r1; the referenced record that is obtained from the relation r2 will also be automatically deleted...

Answer 12

Explanation of Solution

Primary key and foreign key constraint:

Refer to the figure 7.19, which decomposes a relation into third normal form (3NF).

According to the above algorithm, make every α the primary key of a schema ri(αβ) that gets added to the schema according to the rule α→β

Answer 13

Explanation of Solution

Primary key and foreign key constraint:

Refer to the figure 7.19, which decomposes a relation into third normal form (3NF).

According to the above algorithm, make every α the primary key of a schema ri(αβ) that gets added to the schema according to the rule α→β

Answer 14

Expert Solution & Answer

Answer 15

Expert Solution & Answer

Answer 16

Want to see the full answer?

Check out a sample textbook solution

See solution

Answer 17

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

Primary key and foreign key constraint: The given functional dependency (FD) which is used to decompose the given relational schema r into r1 and r2 is considered: Considering the decomposed relation r1 and r2:

Explanation of Solution

Primary key and foreign key constraint: The given functional dependency (FD) which is used to decompose the given relational schema r into r1 and r2 is considered: Considering the decomposed relation r1 and r2:

Explanation of Solution

Inconsistency that could arise: When the foreign key constraint is not enforced on the relation r1 and r2 the following inconsistency may arise: Consider a record is deleted from the relation r1; the referenced record that is obtained from the relation r2 will also be automatically deleted...

Explanation of Solution

Primary key and foreign key constraint: Refer to the figure 7.19, which decomposes a relation into third normal form (3NF). According to the above algorithm, make every α the primary key of a schema ri(αβ) that gets added to the schema according to the rule α→β

Want to see the full answer?

Chapter 7 Solutions

Primary key and foreign key constraint:

The given functional dependency (FD) which is used to decompose the given relational schema r into r1 and r2 is considered:

Considering the decomposed relation r1 and r2:

Inconsistency that could arise:

When the foreign key constraint is not enforced on the relation r1 and r2 the following inconsistency may arise:

Consider a record is deleted from the relation r1; the referenced record that is obtained from the relation r2 will also be automatically deleted...

Primary key and foreign key constraint:

Refer to the figure 7.19, which decomposes a relation into third normal form (3NF).

According to the above algorithm, make every α the primary key of a schema ri(αβ) that gets added to the schema according to the rule α→β