Answered: Which of the following queries…

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 of the following queries identifies other customers who were referred to JustLee Books by the same person who referred Jorge Perez?
a. SELECT customer# FROM customers
WHERE referred = (SELECT referred FROM customers
WHERE firstname = 'JORGE'
AND lastname = 'PEREZ');
b. SELECT referred FROM customers
WHERE (customer#, referred) = (SELECT customer#
FROM customers WHERE firstname = 'JORGE'
AND lastname = 'PEREZ');
c. SELECT referred FROM customers
WHERE (customer#, referred) IN (SELECT customer#
FROM customers WHERE firstname = 'JORGE'
AND lastname = 'PEREZ');
d. SELECT customer# FROM customers
WHERE customer# = (SELECT customer#
FROM customers WHERE firstname = 'JORGE'
AND lastname = 'PEREZ');

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