Primary Key: A Primary Key in a database table is a field in the table that uniquely identifies every row or record present in the database table. Example: Students in Universities are assigned a unique registration number. Therefore, in a STUDENT database table, the attribute “reg_no” acts as primary key. Entity Integrity: Entity Integrity is a mechanism that is used to protect primary keys in the database. Entity Integrity ensures the following properties for primary key: The primary key of one database table row must not match the primary key of any other row present in the table. No component of primary key must be null.

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Answer 1

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Chapter 3, Problem 13P

Program Plan Intro

Primary Key:

A Primary Key in a database table is a field in the table that uniquely identifies every row or record present in the database table.

Example:

Students in Universities are assigned a unique registration number.

Therefore, in a STUDENT database table, the attribute “reg_no” acts as primary key.

Entity Integrity:

Entity Integrity is a mechanism that is used to protect primary keys in the database. Entity Integrity ensures the following properties for primary key:

The primary key of one database table row must not match the primary key of any other row present in the table.

No component of primary key must be null.

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Do the tables exihibit referential integrity.Answer yes or no, and then explain your answer.

Write foreign key constraints for the relationships in each of these tables. Make your own assumptions regarding cascading updates and deletions and justify those assumptions. (Hint: You can combine the SQL for your answers to parts A and B.)

Define the term referential integrity constraint. Give an example of a referential integrity constraint for the tables you created for question 1.8.

Answer 2

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Chapter 3, Problem 13P

Program Plan Intro

Primary Key:

A Primary Key in a database table is a field in the table that uniquely identifies every row or record present in the database table.

Example:

Students in Universities are assigned a unique registration number.

Therefore, in a STUDENT database table, the attribute “reg_no” acts as primary key.

Entity Integrity:

Entity Integrity is a mechanism that is used to protect primary keys in the database. Entity Integrity ensures the following properties for primary key:

The primary key of one database table row must not match the primary key of any other row present in the table.

No component of primary key must be null.

Expert Solution & Answer

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Answer 3

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Chapter 3, Problem 13P

Program Plan Intro

Primary Key:

A Primary Key in a database table is a field in the table that uniquely identifies every row or record present in the database table.

Example:

Students in Universities are assigned a unique registration number.

Therefore, in a STUDENT database table, the attribute “reg_no” acts as primary key.

Entity Integrity:

Entity Integrity is a mechanism that is used to protect primary keys in the database. Entity Integrity ensures the following properties for primary key:

The primary key of one database table row must not match the primary key of any other row present in the table.

No component of primary key must be null.

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Answer 4

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Chapter 3, Problem 13P

Program Plan Intro

Primary Key:

A Primary Key in a database table is a field in the table that uniquely identifies every row or record present in the database table.

Example:

Students in Universities are assigned a unique registration number.

Therefore, in a STUDENT database table, the attribute “reg_no” acts as primary key.

Entity Integrity:

Entity Integrity is a mechanism that is used to protect primary keys in the database. Entity Integrity ensures the following properties for primary key:

The primary key of one database table row must not match the primary key of any other row present in the table.

No component of primary key must be null.

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Answer 7

Chapter 3, Problem 13P

Program Plan Intro

Primary Key:

A Primary Key in a database table is a field in the table that uniquely identifies every row or record present in the database table.

Example:

Students in Universities are assigned a unique registration number.

Therefore, in a STUDENT database table, the attribute “reg_no” acts as primary key.

Entity Integrity:

Entity Integrity is a mechanism that is used to protect primary keys in the database. Entity Integrity ensures the following properties for primary key:

The primary key of one database table row must not match the primary key of any other row present in the table.

No component of primary key must be null.

Answer 8

Chapter 3, Problem 13P

Program Plan Intro

Primary Key:

A Primary Key in a database table is a field in the table that uniquely identifies every row or record present in the database table.

Example:

Students in Universities are assigned a unique registration number.

Therefore, in a STUDENT database table, the attribute “reg_no” acts as primary key.

Entity Integrity:

Entity Integrity is a mechanism that is used to protect primary keys in the database. Entity Integrity ensures the following properties for primary key:

The primary key of one database table row must not match the primary key of any other row present in the table.

No component of primary key must be null.

Answer 9

Chapter 3, Problem 13P

Program Plan Intro

Primary Key:

A Primary Key in a database table is a field in the table that uniquely identifies every row or record present in the database table.

Example:

Students in Universities are assigned a unique registration number.

Therefore, in a STUDENT database table, the attribute “reg_no” acts as primary key.

Entity Integrity:

Entity Integrity is a mechanism that is used to protect primary keys in the database. Entity Integrity ensures the following properties for primary key:

The primary key of one database table row must not match the primary key of any other row present in the table.

No component of primary key must be null.

Answer 10

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Answer 11

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Answer 12

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Answer 13

Ch. 3 - What is the difference between a database and a...Ch. 3 - Prob. 2RQ Ch. 3 - Prob. 3RQ Ch. 3 - What are the requirements that two relations must...Ch. 3 - Which relational algebra operators can be applied...Ch. 3 - Explain why the data dictionary is sometimes...Ch. 3 - A database user manually notes that The file...Ch. 3 - Prob. 8RQ Ch. 3 - Prob. 9RQ Ch. 3 - Prob. 10RQ

Solution Summary: The author describes Entity Integrity as a mechanism that is used to protect primary keys in the database.

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Chapter 3 Solutions