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Consider the following Database Schema: s (sid, sname, rating, age) b (bid, bname, color) r (sid", bid', date) Where s = reservations, b = boats, and r = reservations. Sailors reserve specific boats Note: An indicates attribute is a key (underlined) Which of the following relational algebra expressions would find the names of sailors who have reserved all boats called BigBoat O (Insid.bid (r) + mbid (oname="Big Boat'(b))] es) Oasid (lasid.bid (r)+ abid (oname='Big Boat (b))) ) Onsname ([nsid.bid (r)+ nbid (oname="BigBoat' (b))). Onsname (asid,bid (r) + xbid (oname='BigBoat'(b))))

Consider the following Database Schema: s (sid, sname, rating, age) b (bid, bname, color) r (sid", bid', date) Where s = reservations, b = boats, and r = reservations. Sailors reserve specific boats Note: An indicates attribute is a key (underlined) Which of the following relational algebra expressions would find the names of sailors who have reserved all boats called BigBoat O (Insid.bid (r) + mbid (oname="Big Boat'(b))] es) Oasid (lasid.bid (r)+ abid (oname='Big Boat (b))) ) Onsname ([nsid.bid (r)+ nbid (oname="BigBoat' (b))). Onsname (asid,bid (r) + xbid (oname='BigBoat'(b))))

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 following Database Schema: s (sid, sname, rating, age) b (bid, bname, color) r (sid bid, date) Where s = reservations, b = boats, and r = reservations. Sailors reserve specific boats Note: An indicates attribute is a key (underlined) Which of the following relational algebra expressions would find the names of sailors who have reserved all boats called BigBoat O (Insid.bid (r) +mbid (oname="Big Boat'(b))]s) Oasid (lasid,bid (r) + zbid (oname='Big Boat' (b))] ) Onsname ([nsid,bid (r)+ nbid (oname="BigBoat' (b))]) Onsname ([nsid,bid (r) + xbid (oname='BigBoat'(b))) )
Transcribed Image Text:Consider the following Database Schema: s (sid, sname, rating, age) b (bid, bname, color) r (sid bid, date) Where s = reservations, b = boats, and r = reservations. Sailors reserve specific boats Note: An indicates attribute is a key (underlined) Which of the following relational algebra expressions would find the names of sailors who have reserved all boats called BigBoat O (Insid.bid (r) +mbid (oname="Big Boat'(b))]s) Oasid (lasid,bid (r) + zbid (oname='Big Boat' (b))] ) Onsname ([nsid,bid (r)+ nbid (oname="BigBoat' (b))]) Onsname ([nsid,bid (r) + xbid (oname='BigBoat'(b))) )
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