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Consider the Sailors-Boats-Reserves database. Which SQL queries answer this question? Find the names and ages of sailors who have reserved at least two different boats. Select one or more: a. SELECT distinct s.sname, s.age FROM sailors s, reserves r1 WHERE s.sid=r1.sid AND EXISTS (SELECT r2.sid FROM reserves r2 WHERE s.sid=r2.sid AND r1.bid<>r2.bid) Ob. OC. O d. SELECT distinct s.sname, s.age FROM sailors s, reserves r1, reserves r2 WHERE s.sid=r1.sid AND s.sid=r2.sid AND r1.bid = r2.bid SELECT distinct s.sname, s.age FROM sailors s, reserves r1, reserves r2 WHERE s.sid=r1.sid AND s.sid=r2.sid AND r1.bid<>r2.bid SELECT s.sname, s.age FROM sailors s, reserves r WHERE s.sid=r.sid GROUP BY s.sid, s.sname HAVING 2<= Count(r.bid) □e. SELECT s.sname, s.age FROM sailors s, reserves r WHERE s.sid=r.sid GROUP BY s.sid, s.age, s.sname HAVING 2<= Count(DISTINCT r.bid)

Consider the Sailors-Boats-Reserves database. Which SQL queries answer this question? Find the names and ages of sailors who have reserved at least two different boats. Select one or more: a. SELECT distinct s.sname, s.age FROM sailors s, reserves r1 WHERE s.sid=r1.sid AND EXISTS (SELECT r2.sid FROM reserves r2 WHERE s.sid=r2.sid AND r1.bid<>r2.bid) Ob. OC. O d. SELECT distinct s.sname, s.age FROM sailors s, reserves r1, reserves r2 WHERE s.sid=r1.sid AND s.sid=r2.sid AND r1.bid = r2.bid SELECT distinct s.sname, s.age FROM sailors s, reserves r1, reserves r2 WHERE s.sid=r1.sid AND s.sid=r2.sid AND r1.bid<>r2.bid SELECT s.sname, s.age FROM sailors s, reserves r WHERE s.sid=r.sid GROUP BY s.sid, s.sname HAVING 2<= Count(r.bid) □e. SELECT s.sname, s.age FROM sailors s, reserves r WHERE s.sid=r.sid GROUP BY s.sid, s.age, s.sname HAVING 2<= Count(DISTINCT r.bid)

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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Consider the Sailors-Boats-Reserves database. Which SQL queries answer this question? Find the names and ages of sailors who have reserved at least two different boats. Select one or more: a. b. OC. O d. e. SELECT distinct s.sname, s.age FROM sailors s, reserves r1 WHERE s.sid=r1.sid AND EXISTS (SELECT r2.sid FROM reserves r2 WHERE s.sid=r2.sid AND r1.bid<>r2.bid) SELECT distinct s.sname, s.age FROM sailors s, reserves r1, reserves r2 WHERE s.sid=r1.sid AND s.sid=r2.sid AND r1.bid = r2.bid SELECT distinct s.sname, s.age FROM sailors s, reserves r1, reserves r2 WHERE s.sid=r1.sid AND s.sid=r2.sid AND r1.bid<>r2.bid SELECT s.sname, s.age FROM sailors s, reserves r WHERE s.sid=r.sid GROUP BY s.sid, s.sname HAVING 2<= Count(r.bid) SELECT s.sname, s.age FROM sailors s, reserves r WHERE s.sid=r.sid GROUP BY s.sid, s.age, s.sname HAVING 2<= Count(DISTINCT r.bid)
Transcribed Image Text:Consider the Sailors-Boats-Reserves database. Which SQL queries answer this question? Find the names and ages of sailors who have reserved at least two different boats. Select one or more: a. b. OC. O d. e. SELECT distinct s.sname, s.age FROM sailors s, reserves r1 WHERE s.sid=r1.sid AND EXISTS (SELECT r2.sid FROM reserves r2 WHERE s.sid=r2.sid AND r1.bid<>r2.bid) SELECT distinct s.sname, s.age FROM sailors s, reserves r1, reserves r2 WHERE s.sid=r1.sid AND s.sid=r2.sid AND r1.bid = r2.bid SELECT distinct s.sname, s.age FROM sailors s, reserves r1, reserves r2 WHERE s.sid=r1.sid AND s.sid=r2.sid AND r1.bid<>r2.bid SELECT s.sname, s.age FROM sailors s, reserves r WHERE s.sid=r.sid GROUP BY s.sid, s.sname HAVING 2<= Count(r.bid) SELECT s.sname, s.age FROM sailors s, reserves r WHERE s.sid=r.sid GROUP BY s.sid, s.age, s.sname HAVING 2<= Count(DISTINCT r.bid)
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