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Write a query to list the isbn of the books along with the number of authors for each book. If a book does not have an author, it should not appear on the result set.

Write a query to list the isbn of the books along with the number of authors for each book. If a book does not have an author, it should not appear on the result set.

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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6. Write a query to list the isbn of the books along with the number of authors for each book. If a book does not have an author, it should not appear on the result set.
Transcribed Image Text:6. Write a query to list the isbn of the books along with the number of authors for each book. If a book does not have an author, it should not appear on the result set.
mysql> DESC bookauthor; mysql> DESC author; mysql> DESC book; | Field | Туре | Field | Туре | Field Тур | int(11 | varchai author_order | int(11 royaltyshare | decima: author_id isbn | author_id | int(1: | ssn lastname | firstname | varch: | phone | address | city | state | zip | varch: | varch: isbn var I name | type pub_id I price | advance I ytd_sales I pubdate var var | varch: | varch: | varch: | varch: | varch: | int dec | dec int mysql> DESC bookeditor; | dat | Field | Туре mysql> DESC editor; mysql> DESC publisher; editor_id | int(11) | varchar(1 | Field isbn | Field | Туре editor_id ssn pub_id | int(11) | varchar(40) varchar(40) varchar(20) varchar(2) lastname name firstname address | phone editor_position salary | city state
Transcribed Image Text:mysql> DESC bookauthor; mysql> DESC author; mysql> DESC book; | Field | Туре | Field | Туре | Field Тур | int(11 | varchai author_order | int(11 royaltyshare | decima: author_id isbn | author_id | int(1: | ssn lastname | firstname | varch: | phone | address | city | state | zip | varch: | varch: isbn var I name | type pub_id I price | advance I ytd_sales I pubdate var var | varch: | varch: | varch: | varch: | varch: | int dec | dec int mysql> DESC bookeditor; | dat | Field | Туре mysql> DESC editor; mysql> DESC publisher; editor_id | int(11) | varchar(1 | Field isbn | Field | Туре editor_id ssn pub_id | int(11) | varchar(40) varchar(40) varchar(20) varchar(2) lastname name firstname address | phone editor_position salary | city state
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