Use the following schema to answer the questions 1-3 below.
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
![Part 1: Use the following schema to answer the questions 1-3 below. This schema refers to a gaming
organization. There can be any number of players per game. Each game and each tournament has one
winner; if the game or tournament is ongoing, the winner is null. The gameWinner and
tournamentWinner attributes are foreign keys for memberID.
Member (memberlD, memberName, joinDate)
Game (gamelD, gameType, gameDate, gameWinner, tournamentName)
MemberGame (memberlD, gamelD)
Tournament (tournamentName, tournamentWinner)
1. Write a description of what each of the following queries does:
a.
SELECT memberID, gamelD
FROM Member NATURAL JOIN MemberGame NATURAL JOIN Game
WHERE joinDate < "2021-01-01" AND gameDate >= "2021-01-01"
b. Write two functionally different relational algebra statements equivalent to the query in
1a.
C. Which of your answers to question 3 will most likely be processed faster? Justify your
answer.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F12fb9030-e9f0-48f0-bd41-ee9204d12d88%2Fa747e19e-add3-4e6b-aedd-f4807366cd58%2Fiwz1d2_processed.jpeg&w=3840&q=75)
Transcribed Image Text:Part 1: Use the following schema to answer the questions 1-3 below. This schema refers to a gaming
organization. There can be any number of players per game. Each game and each tournament has one
winner; if the game or tournament is ongoing, the winner is null. The gameWinner and
tournamentWinner attributes are foreign keys for memberID.
Member (memberlD, memberName, joinDate)
Game (gamelD, gameType, gameDate, gameWinner, tournamentName)
MemberGame (memberlD, gamelD)
Tournament (tournamentName, tournamentWinner)
1. Write a description of what each of the following queries does:
a.
SELECT memberID, gamelD
FROM Member NATURAL JOIN MemberGame NATURAL JOIN Game
WHERE joinDate < "2021-01-01" AND gameDate >= "2021-01-01"
b. Write two functionally different relational algebra statements equivalent to the query in
1a.
C. Which of your answers to question 3 will most likely be processed faster? Justify your
answer.
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