SQL The database you will use for this assignment contains information related t
ID: 3722311 • Letter: S
Question
SQL
The database you will use for this assignment contains information related to Major League Baseball (MLB) about players, teams, and games. The relations are:
Players(playerID, playerName, team, position, birthYear)
playerID is a player identifier used in MLB, and all players throughout the history of baseball have a unique ID
playerName is player’s name
team is the name of the MLB team the player is currently playing on (or the last team the player played for if they are not currently playing)
position is the position of the player
birthYear is the year that player was born
Teams(teamID, teamName, home, leagueName)
teamID is a unique ID internal to MLB.
teamName is the name of the team
home is the home city of the team
leagueName is the league the team is in, i.e. either “National” or “American”, which stands for “National League” and “American League”, respectively
Games(gameID, homeTeamID, guestTeamID, date)
gameID is a unique ID used internally in MLB
homeTeamID is the ID of the hometeam
guestTeamID is the ID of the visiting team
date is the date of the game.
A sample instance of this database is given at the end of this homework handout. Since it is just one instance of the database designed to give you some intuition, you should not “customize” your answer to work only with this instance.
Write the following queries in SQL, using the schema provided above.
(c) Print all tuples (teamID1, league1, teamID2, league2, date) where teamID1 and teamID2 played against each other in a World Series game. Although there is no direct information about the World Series games in the relations, we can infer that when two teams from different leagues play each other, it is a World Series game. So, in this relation, league1 and league2 should be different leagues.
(d) List all cities that have a team in all leagues. For example, there are currently two leagues (National and American). Although not shown in this instance, New York is home to the Mets in the National league as well as the Yankees in the American league (Chicago also has one in each league, for those of you who are baseball fans). Remember that your query must work over all instances of this schema, even if there are more than two leagues in the instance.
Players
playerID
playerName
team
position
birthYear
1
Javy Lopez
Braves
Catcher
1970
2
Cliff Lee
Phillies
Pitcher
1978
3
Derek Jeter
Yankees
Infielder
1974
4
Skip Schumaker
Cardinals
Infielder
1980
5
Dominic Brown
Phillies
Outfielder
1987
Teams
teamID
teamName
home
leagueName
1
Phillies
Philadelphia
National
2
Braves
Atlanta
National
3
Yankees
New York
American
4
Twins
Minnesota
American
5
Rangers
Texas
American
6
Cubs
Chicago
National
Games
gameID
homeTeamID
guestTeamID
Date
1
3
6
04/21/2010
2
1
4
04/21/2010
3
2
5
04/30/2010
4
6
3
05/02/2010
5
4
5
05/02/2010
6
1
5
05/06/2010
playerID
playerName
team
position
birthYear
1
Javy Lopez
Braves
Catcher
1970
2
Cliff Lee
Phillies
Pitcher
1978
3
Derek Jeter
Yankees
Infielder
1974
4
Skip Schumaker
Cardinals
Infielder
1980
5
Dominic Brown
Phillies
Outfielder
1987
Explanation / Answer
c
Select t1.teamID,t1.leagueName,t2.teamID,t2.leagueName from Teams t1 , Teams t2 where t1.leagueName != t2.leagueName;
the two instances of table Teams are used to compare leagueNames
d
Select home from Teams where leagueName = ALL(Select distinct leagueName from Teams);
Here ALL will return all the leagueNames and corresponding home city is displayed
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