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SELECT PRIMARY KEY For data kept by a single publisher - it contains an entity BOOK, the following is known about the four attributes identified as candidate keys: BookName varchar(50), is always known for each book, and no two books have the same book name ISBN char(13), is unique and always known including for all books REFNumber char(10) is an internal 10 digit code assigned to every book but is commonly shared by multiple editions of the book. PubDate is the date on which the book is published. The publisher, never publishes two books on same date. Prior to publishing, every book still has a value which reflects the tentative publish date, and this is frequently revised through out the publication process. Based on the description above, the best suited attribute for primary key is (only one choice is correct): ISBN REFNumber PubDate Book Name

SELECT PRIMARY KEY For data kept by a single publisher - it contains an entity BOOK, the following is known about the four attributes identified as candidate keys: BookName varchar(50), is always known for each book, and no two books have the same book name ISBN char(13), is unique and always known including for all books REFNumber char(10) is an internal 10 digit code assigned to every book but is commonly shared by multiple editions of the book. PubDate is the date on which the book is published. The publisher, never publishes two books on same date. Prior to publishing, every book still has a value which reflects the tentative publish date, and this is frequently revised through out the publication process. Based on the description above, the best suited attribute for primary key is (only one choice is correct): ISBN REFNumber PubDate Book Name

Understanding Business
Understanding Business
12th Edition
ISBN:9781259929434
Author:William Nickels
Publisher:William Nickels
Chapter1: Taking Risks And Making Profits Within The Dynamic Business Environment
Section: Chapter Questions
Problem 1CE
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SELECT PRIMARY KEY For data kept by a single publisher - it contains an entity BOOK, the following is known about the four attributes identified as candidate keys: BookName varchar(50), is always known for each book, and no two books have the same book name ISBN char(13), is unique and always known including for all books REFNumber char(10) is an internal 10 digit code assigned to every book but is commonly shared by multiple editions of the book. PubDate is the date on which the book is published. The publisher, never publishes two books on same date. Prior to publishing, every book still has a value which reflects the tentative publish date, and this is frequently revised through out the publication process. Based on the description above, the best suited attribute for primary key is (only one choice is correct): ISBN REFNumber PubDate Book Name
Transcribed Image Text:SELECT PRIMARY KEY For data kept by a single publisher - it contains an entity BOOK, the following is known about the four attributes identified as candidate keys: BookName varchar(50), is always known for each book, and no two books have the same book name ISBN char(13), is unique and always known including for all books REFNumber char(10) is an internal 10 digit code assigned to every book but is commonly shared by multiple editions of the book. PubDate is the date on which the book is published. The publisher, never publishes two books on same date. Prior to publishing, every book still has a value which reflects the tentative publish date, and this is frequently revised through out the publication process. Based on the description above, the best suited attribute for primary key is (only one choice is correct): ISBN REFNumber PubDate Book Name
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