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, Problem 11RQ

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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Chapter 5, Problem 11RQ

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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Chapter 5, Problem 11RQ

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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Chapter 5, Problem 11RQ

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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Chapter 5, Problem 11RQ

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

Chapter 5, Problem 11RQ

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 9

Chapter 5, Problem 11RQ

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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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 the difference between partial...Ch. 5 - Prob. 7RQ Ch. 5 - According to the data model, is it required that...Ch. 5 - Prob. 9RQ 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.

Chapter 5 Solutions