By De Wen Zhong

 This database holds data about the teams that are involved in the AFL  There are eight tables altogether each holding data about various things related to each team.  There is a table that contains data on each of the teams such as when they joined the league and how many premierships they have won in the past.  Has information about players and what teams they play for at the moment as well as the team they may have transferred from.  Has coach information such as who they coach and what type of coach they are (Head or Assistant).  Information in each team’s home grounds in which they play at such as the capacity and location.  Also has information on what the team colours are for each team.

ColoursColourIDColourName TeamColoursTeamName*ColourID* TeamsTeamNameTeamStartTeamPremiershipsTeamMascot VenueDetailsVenueIDVenueNameLocationCapacity TeamVenueTeamName*VenueID* TeamPlayerTeamName*PlayerID*PastClubs* PlayerDetailsPlayerIDPlayerLastNamePlayerFirstNameDebutDOB CoachDetailsCoachIDTeamName*CoachLastNameCoachFirstNameCoachTypeFirstYearCoachPremierships

 One team can have many coaches coachlastname | teamname coachlastname | teamname Clarkson | Hawthorn Clarkson | Hawthorn Connelly | Fremantle Connelly | Fremantle Craig | Adelaide Craig | Adelaide Daniher | Melbourne Daniher | Melbourne Eade | Footscray Eade | Footscray Laidley | North Melbourne Laidley | North Melbourne Lyon | St Kilda Lyon | St Kilda Malthouse | Collingwood Malthouse | Collingwood Matthews | Brisbane/Fitzroy Matthews | Brisbane/Fitzroy Pagan | Carlton Pagan | Carlton Roos | Sydney/South Melbourne Roos | Sydney/South Melbourne Sheedy | Essendon Sheedy | Essendon Thompson | Geelong Thompson | Geelong Wallace | Richmond Wallace | Richmond Williams | Port Adelaide Williams | Port Adelaide Worsfold | West Coast Worsfold | West Coast Longmire | Sydney/South Melbourne Longmire | Sydney/South Melbourne Blakey | Sydney/South Melbourne Blakey | Sydney/South Melbourne Berbakov | Sydney/South Melbourne Berbakov | Sydney/South Melbourne Allison | Sydney/South Melbourne Allison | Sydney/South Melbourne (20 rows) TeamsTeamNameTeamStartTeamPremiershipsTeamMascot CoachDetailsCoachIDTeamName*CoachLastNameCoachFirstNameCoachTypeFirstYearCoachPremierships Foreign Key Primary key

 One team can have many colours while many teams can share one colour ColoursColourIDColourName TeamColoursTeamName*ColourID* TeamsTeamNameTeamStartTeamPremiershipsTeamMascot Primary Key Foriegn Key Primary Key Foriegn Key

 One team can have many colours while many teams can share one colour colourid | colourname colourid | colourname | Black 1 | Black 2 | Blue 2 | Blue 3 | Brown 3 | Brown 4 | Green 4 | Green 5 | Maroon 5 | Maroon 6 | Navy Blue 6 | Navy Blue 7 | Red 7 | Red 8 | Teal 8 | Teal 9 | Yellow 9 | Yellow 10 | White 10 | White (10 rows) teamname | other columns teamname | other columns Adelaide |... Adelaide |... Brisbane/Fitzroy |... Brisbane/Fitzroy |... Carlton |... Carlton |... Collingwood |... Collingwood |... Essendon |... Essendon |... Fremantle |... Fremantle |... Geelong |... Geelong | |... (16 rows) teamname | colourid teamname | colourid Adelaide | 1 Adelaide | 1 Adelaide | 7 Adelaide | 7 Adelaide | 9 Adelaide | 9 Brisbane/Fitzroy | 9 Brisbane/Fitzroy | 9 Brisbane/Fitzroy | 5 Brisbane/Fitzroy | 5 Carlton | 10 Carlton | 10 Carlton | 6 Carlton | 6 Collingwood | 1 Collingwood | 1 Collingwood | 10 Collingwood | | |... (39 rows) Colours TeamColours Teams ColourID comes from Colours table TeamName comes from Teams table

 Show all the teams that have won more than 2 premierships SELECT teamname, teamstart, teampremierships FROM teams WHERE teampremierships >2; teamname | teamstart | teampremierships teamname | teamstart | teampremierships Brisbane/Fitzroy | 1983 | 11 Brisbane/Fitzroy | 1983 | 11 Carlton | 1897 | 16 Carlton | 1897 | 16 Collingwood | 1897 | 14 Collingwood | 1897 | 14 Essendon | 1897 | 16 Essendon | 1897 | 16 Geelong | 1859 | 6 Geelong | 1859 | 6 Hawthorn | 1873 | 9 Hawthorn | 1873 | 9 North Melbourne | 1869 | 4 North Melbourne | 1869 | 4 Melbourne | 1856 | 12 Melbourne | 1856 | 12 Richmond | 1908 | 10 Richmond | 1908 | 10 Sydney/South Melbourne | 1897 | 4 Sydney/South Melbourne | 1897 | 4 West Coast | 1987 | 3 West Coast | 1987 | 3 (11 rows)

 Show the coaches who are coaching Sydney/South Melbourne SELECT teamname, coachlastname, coachfirstname, coachtype FROM teams NATURAL JOIN coachdetails WHERE teamname = ‘Sydney/South Melbourne’; teamname | coachlastname | coachfirstname | coachtype teamname | coachlastname | coachfirstname | coachtype Sydney/South Melbourne | Roos | Paul | Head Coach Sydney/South Melbourne | Roos | Paul | Head Coach Sydney/South Melbourne | Longmire | John | Assistant Coach Sydney/South Melbourne | Longmire | John | Assistant Coach Sydney/South Melbourne | Blakey | John | Assistant Coach Sydney/South Melbourne | Blakey | John | Assistant Coach Sydney/South Melbourne | Berbakov | Peter | Assistant Coach Sydney/South Melbourne | Berbakov | Peter | Assistant Coach Sydney/South Melbourne | Allison | Brett | Assistant Coach Sydney/South Melbourne | Allison | Brett | Assistant Coach (5 rows)

 Show which coach is coaching which team SELECT teams.teamname, coachlastname, coachfirstname, coachtype FROM teams, coachdetails WHERE teams.teamname = coachdetails.teamname AND teams.teamname = ‘Sydney/South Melbourne’; teamname | coachlastname | coachfirstname | coachtype teamname | coachlastname | coachfirstname | coachtype Sydney/South Melbourne | Roos | Paul | Head Coach Sydney/South Melbourne | Roos | Paul | Head Coach Sydney/South Melbourne | Longmire | John | Assistant Coach Sydney/South Melbourne | Longmire | John | Assistant Coach Sydney/South Melbourne | Blakey | John | Assistant Coach Sydney/South Melbourne | Blakey | John | Assistant Coach Sydney/South Melbourne | Berbakov | Peter | Assistant Coach Sydney/South Melbourne | Berbakov | Peter | Assistant Coach Sydney/South Melbourne | Allison | Brett | Assistant Coach Sydney/South Melbourne | Allison | Brett | Assistant Coach (5 rows)

 Show the amount of home grounds a team has given they have more than 1 SELECT teamname, count(*) as amount FROM teamvenue GROUP BY teamname HAVING count(*) >1; teamname | amount teamname | amount Footscray | 4 Footscray | 4 Essendon | 2 Essendon | 2 Collingwood | 2 Collingwood | 2 Hawthorn | 2 Hawthorn | 2 Sydney/South Melbourne | 2 Sydney/South Melbourne | 2 North Melbourne | 3 North Melbourne | 3 Richmond | 2 Richmond | 2 Carlton | 2 Carlton | 2 Melbourne | 3 Melbourne | 3 (9 rows)

 Find the players who have played in the same previous club as ‘Barry Hall’ SELECT playerfirstname, playerlastname, pastclubs FROM teamplayer NATURAL JOIN playerdetails WHERE pastclubs = ( SELECT pastclubs FROM teamplayer NATURAL JOIN playerdetails WHERE playerfirstname = ‘Barry’ AND playerlastname = ‘Hall’; WHERE playerfirstname = ‘Barry’ AND playerlastname = ‘Hall’; playerlastname | playerfirstname playerlastname | playerfirstname Everitt | Peter Everitt | Peter Hall | Barry Hall | Barry (2 rows)

 Find the players who have played in the same previous club as ‘Barry Hall’ SELECT p1.playerfirstname, p1.playerlastname, t1.pastclubs FROM teamplayer t1, teamplayer t2, playerdetails p1, playerdetails p2 WHERE p2.playerfirstname = ‘Barry’ AND p2.playerlastname = ‘Hall’ AND t1.playerno = p1.playerno AND t2.playerno = p2.playerno AND t1.pastclubs = t2.pastclubs; playerlastname | playerfirstname playerlastname | playerfirstname Everitt | Peter Everitt | Peter Hall | Barry Hall | Barry (2 rows)

 CHECK statements makes sure the user does not enter in invalid data  To check for a valid year for a team to join the league CONSTRAINT TeamStart CHECK(TeamStart >= 1856)  Check for a valid capacity for a venue (more then people but less than people) CONSTRAINT Capacity CHECK((Capacity > 10000) AND (Capacity 10000) AND (Capacity < ))  Check for a valid debut year for a player (after 1970) CONSTRAINT Debut CHECK(Debut >= 1970)  Check for a valid date of birth for a player (after 1950) CONSTRAINT DOB CHECK(DOB >= 1950)

 Check the coachtype will be either head coach or assistant coach CONSTRAINT CoachType CHECK((CoachType = 'Head Coach') OR (CoachType = 'Assistant Coach'))  Check the first year of the coach coaching is after 1950 CONSTRAINT FirstYear CHECK(FirstYear >= 1950)

 Make sure to retain the integrity of the database  When one record is dependent an another, when the main record is deleted, delete the dependent record as well  When one record is dependent an another, when the main record is being changed, change the dependent record as well CONSTRAINT TeamNameFK FOREIGN KEY (TeamName) REFERENCEs Teams ON DELETE CASCADE ON UPDATE CASCADE, ON UPDATE CASCADE,

 Show all the venues that Footscray plays on as a home ground CREATE VIEW footscrayvenues (venuename, location, capacity) CREATE VIEW footscrayvenues (venuename, location, capacity) AS SELECT venuename, location, capacity FROM teamvenue natural join venuedetails WHERE teamname = 'Footscray'; venuename | location | capacity venuename | location | capacity Melbourne Cricket Ground | Melbourne | Melbourne Cricket Ground | Melbourne | Telstra Dome | Melbourne | Telstra Dome | Melbourne | Manuka Oval | Canberra | Manuka Oval | Canberra | Marrara Oval | Darwin | Marrara Oval | Darwin | (4 rows)

 Show all the venues that Footscray plays on as a home ground that has a capacity of over SELECT * FROM footscrayvenues SELECT * FROM footscrayvenues WHERE capacity > 50000; venuename | location | capacity venuename | location | capacity Melbourne Cricket Ground | Melbourne | Melbourne Cricket Ground | Melbourne | Telstra Dome | Melbourne | Telstra Dome | Melbourne | (2 rows)