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a) Which one of the following queries finds sailors who have reserved at least a boat but not a red boat? Query1: SELECT R.sid FROM Boats B, Reserves R WHERE B.bid=R.bid AND B.color<>’red’ Query2: SELECT R.sid FROM Reserves R EXCEPT SELECT R.sid FROM Boats B, Reserves R WHERE B.bid=R.bid AND B.color=’red’   b) What are the results of query1 and query2 in part A, considering the following instances of Sailors and Reserves tables? (images attached)

a) Which one of the following queries finds sailors who have reserved at least a boat but not a red boat? Query1: SELECT R.sid FROM Boats B, Reserves R WHERE B.bid=R.bid AND B.color<>’red’ Query2: SELECT R.sid FROM Reserves R EXCEPT SELECT R.sid FROM Boats B, Reserves R WHERE B.bid=R.bid AND B.color=’red’   b) What are the results of query1 and query2 in part A, considering the following instances of Sailors and Reserves tables? (images attached)

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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Question

a) Which one of the following queries finds sailors who have
reserved at least a boat but not a red boat?

Query1:
SELECT R.sid
FROM Boats B, Reserves R
WHERE B.bid=R.bid AND B.color<>’red’


Query2:
SELECT R.sid
FROM Reserves R
EXCEPT
SELECT R.sid
FROM Boats B, Reserves R
WHERE B.bid=R.bid AND B.color=’red’

 

b) What are the results of query1 and query2 in part A,
considering the following instances of Sailors and Reserves tables? (images attached)

SID BID 1 1 3 101 3 102 3 103 101 104 DAY 10-OCT-17 10-OCT-19 10-JUL-19 10-OCT-18 07-NOV-17 BID BNAME 101 Interlake 102 Interlake 103 Clipper 104 Marine COLOR blue red green red
Transcribed Image Text:SID BID 1 1 3 101 3 102 3 103 101 104 DAY 10-OCT-17 10-OCT-19 10-JUL-19 10-OCT-18 07-NOV-17 BID BNAME 101 Interlake 102 Interlake 103 Clipper 104 Marine COLOR blue red green red
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