Primary key (PK): To identify each record in a table, at least there must be one data field, which should be unique. That is corresponding data field of every record should be unique. It is called primary key. Primary key is used to identify the unique record from a collection of records.

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Question

Chapter 5, Problem 12RQ

Program Plan Intro

Primary key (PK):

To identify each record in a table, at least there must be one data field, which should be unique.

That is corresponding data field of every record should be unique.

It is called primary key.

Primary key is used to identify the unique record from a collection of records.

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Answer 2

Question

Chapter 5, Problem 12RQ

Program Plan Intro

Primary key (PK):

To identify each record in a table, at least there must be one data field, which should be unique.

That is corresponding data field of every record should be unique.

It is called primary key.

Primary key is used to identify the unique record from a collection of records.

Expert Solution & Answer

Want to see the full answer?

Check out a sample textbook solution

See solution

Answer 3

Question

Chapter 5, Problem 12RQ

Program Plan Intro

Primary key (PK):

To identify each record in a table, at least there must be one data field, which should be unique.

That is corresponding data field of every record should be unique.

It is called primary key.

Primary key is used to identify the unique record from a collection of records.

Expert Solution & Answer

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Check out a sample textbook solution

See solution

Answer 4

Question

Chapter 5, Problem 12RQ

Program Plan Intro

Primary key (PK):

To identify each record in a table, at least there must be one data field, which should be unique.

That is corresponding data field of every record should be unique.

It is called primary key.

Primary key is used to identify the unique record from a collection of records.

Expert Solution & Answer

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Check out a sample textbook solution

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Answer 5

Chapter 5, Problem 12RQ

Program Plan Intro

Primary key (PK):

To identify each record in a table, at least there must be one data field, which should be unique.

That is corresponding data field of every record should be unique.

It is called primary key.

Primary key is used to identify the unique record from a collection of records.

Answer 6

Chapter 5, Problem 12RQ

Program Plan Intro

Primary key (PK):

To identify each record in a table, at least there must be one data field, which should be unique.

That is corresponding data field of every record should be unique.

It is called primary key.

Primary key is used to identify the unique record from a collection of records.

Answer 7

Chapter 5, Problem 12RQ

Program Plan Intro

Primary key (PK):

To identify each record in a table, at least there must be one data field, which should be unique.

That is corresponding data field of every record should be unique.

It is called primary key.

Primary key is used to identify the unique record from a collection of records.

Answer 8

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Answer 9

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Answer 10

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Answer 11

Ch. 5 - Prob. 1RQ Ch. 5 - What kinds of data would you store in an entity...Ch. 5 - Prob. 3RQ Ch. 5 - What is a subtype discriminator? Give an example...Ch. 5 - Prob. 5RQ Ch. 5 - What is a disjoint subtype? Give an example.Ch. 5 - What is the difference between partial...Ch. 5 - Prob. 8RQ Ch. 5 - According to the data model, is it required that...Ch. 5 - Prob. 10RQ

Primary key (PK): To identify each record in a table, at least there must be one data field, which should be unique. That is corresponding data field of every record should be unique. It is called primary key. Primary key is used to identify the unique record from a collection of records.

Solution Summary: The author explains the characteristics of a desirable primary key: Unique values, embedded semantic meaning, and security-compliant.

Concept explainers

Primary key (PK):

To identify each record in a table, at least there must be one data field, which should be unique.

That is corresponding data field of every record should be unique.

It is called primary key.

Primary key is used to identify the unique record from a collection of records.

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Chapter 5 Solutions