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 * FROM Member LEFT OUTER JOIN Tournament ON memberlD = tournamentWinner; b. UPDATE Member SET memberName = "Devon Chance" WHERE memberID = 100154; SELECT memberID, gamelD FROM Member NATURAL JOIN MemberGame NATURAL JOIN Game с. WHERE join Date < "2021-01-01" AND gameDate >= "2021-01-01"

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
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
FROM Member LEFT OUTER JOIN Tournament ON memberlD = tournamentWinner;
b. UPDATE Member
SET memberName = "Devon Chance"
WHERE memberID = 100154;
C.
SELECT memberlD, gamelD
FROM Member NATURAL JOIN MemberGame NATURAL JOIN Game
WHERE joinDate < "2021-01-01" AND gameDate >= "2021-01-01"
2. Write two functionally different relational algebra statements equivalent to the query in 2c.
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 FROM Member LEFT OUTER JOIN Tournament ON memberlD = tournamentWinner; b. UPDATE Member SET memberName = "Devon Chance" WHERE memberID = 100154; C. SELECT memberlD, gamelD FROM Member NATURAL JOIN MemberGame NATURAL JOIN Game WHERE joinDate < "2021-01-01" AND gameDate >= "2021-01-01" 2. Write two functionally different relational algebra statements equivalent to the query in 2c.
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