Answered: Which query determines the customers…

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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Question

Which query determines the customers who have ordered the most books from JustLee Books? (refer to the tables in the JustLee Books database.)
a. SELECT customer# FROM orders
JOIN orderitems USING(order#)
HAVING SUM(quantity) = (SELECT
MAX(SUM(quantity)) FROM orders
JOIN orderitems USING(order#)
GROUP BY customer#) GROUP BY customer#;
b. SELECT customer# FROM orders
JOIN orderitems USING(order#)
WHERE SUM(quantity) = (SELECT
MAX(SUM(quantity)) FROM orderitems
GROUP BY customer#);
c. SELECT customer# FROM orders
WHERE MAX(SUM(quantity)) = (SELECT
MAX(SUM(quantity) FROM orderitems
GROUP BY order#);
d. SELECT customer# FROM orders
HAVING quantity = (SELECT MAX(SUM(quantity))
FROM orderitems
GROUP BY customer#);

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