теmber(memb_лo, пате) book(isbn, title, authors, publisher) borrowed(memb_no, isbn, date) Figure 3.20 Library database.

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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Consider the library database of Figure 3.20. Write the following queries in SQL.
Find the average number of books borrowed per member. Take into account that if a member does not borrow any books, then that member does
not appear in the borrowed relation at all, but that member still counts in
the average.

теmber(memb_лo, пате)
book(isbn, title, authors, publisher)
borrowed(memb_no, isbn, date)
Figure 3.20 Library database.
Transcribed Image Text:теmber(memb_лo, пате) book(isbn, title, authors, publisher) borrowed(memb_no, isbn, date) Figure 3.20 Library database.
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