Netball case study
Harryanto Surjani
domain
• Team names
• Team locations – where they’re based
• Game venues – Venue name and what the
stadium is called
• Draw – who’s playing who and in what rounds
• Games played – games played so far
erd
1 to M
cityid |
city
--------+-----------1 | Canberra
2 | Melbourne
3 | Hobart
venueid | cityid |
stagename
---------+--------+-------------------------------------------1 |
1 | AIS Arena
2 |
1 | Subway ACT Netball Centre
3 |
2 | State Netball Hockey Centre
M:M
teamid | cityid |
teamname
--------+--------+----------------------1 |
1 | Canberra Darters
2 |
2 | Melbourne Kestrels
3 |
2 | Melbourne Phoenix
drawid | hometeamid | awayteamid | venueid | round
--------+------------+------------+---------+------1 |
2 |
3 |
4 |
1
2 |
7 |
1 |
11 |
1
3 |
8 |
5 |
12 |
1
simple query
select * from hsteam;
Shows all rows in the hsteam table.
teamid | cityid |
teamname
--------+--------+----------------------1 |
1 | Canberra Darters
2 |
2 | Melbourne Kestrels
3 |
2 | Melbourne Phoenix
4 |
4 | Hunter Jaegers
5 |
5 | Adelaide Thunderbirds
6 |
6 | Perth Orioles
7 |
7 | Queensland Firebirds
8 |
9 | Sydney Swift
natural join
select * from hsteam natural join hscity;
Shows which city each team is based in.
cityid | teamid |
teamname
|
city
--------+--------+-----------------------+----------1 |
1 | Canberra Darters
| Canberra
2 |
2 | Melbourne Kestrels
| Melbourne
2 |
3 | Melbourne Phoenix
| Melbourne
4 |
4 | Hunter Jaegers
| Newcastle
5 |
5 | Adelaide Thunderbirds | Sydney
6 |
6 | Perth Orioles
| Perth
7 |
7 | Queensland Firebirds | Brisbane
9 |
8 | Sydney Swift
| Adelaide
cross product
select * from hsteam, hscity where hsteam.cityid = hscity.cityid;
Shows which city each team is based in.
teamid | cityid |
teamname
| cityid |
city
--------+--------+-----------------------+--------+----------1 |
1 | Canberra Darters
|
1 | Canberra
2 |
2 | Melbourne Kestrels
|
2 | Melbourne
3 |
2 | Melbourne Phoenix
|
2 | Melbourne
4 |
4 | Hunter Jaegers
|
4 | Newcastle
5 |
5 | Adelaide Thunderbirds |
5 | Sydney
6 |
6 | Perth Orioles
|
6 | Perth
7 |
7 | Queensland Firebirds |
7 | Brisbane
8 |
9 | Sydney Swift
|
9 | Adelaide
group by
select teamname, count(*) as home_games
from hsdraw natural join hsteam
where hometeamid = teamid
group by teamname;
Shows how many home games each team has.
teamname
| home_games
-----------------------+-----------Melbourne Phoenix
|
7
Perth Orioles
|
7
Adelaide Thunderbirds |
7
Hunter Jaegers
|
7
Melbourne Kestrels
|
7
Queensland Firebirds |
7
Canberra Darters
|
7
Sydney Swift
|
7
subquery
select teamname, awaypoints, homepoints
from hsdraw natural join hsgame, hsteam
where awayteamid=teamid and
awaypoints >= (select max(homepoints) from hsgame);
Shows the most points an away team has had over a home team.
teamname
| awaypoints | homepoints
-----------------------+------------+-----------Adelaide Thunderbirds |
69 |
40
cross product
select home.teamname as home_teamname, away.teamname as away_teamname
from hsdraw, hsgame, hsteam home, hsteam away
where hsdraw.hometeamid = home.teamid and
hsdraw.awayteamid=away.teamid and
homepoints > awaypoints and
round = 1 and
hsgame.drawid=hsdraw.drawid;
Shows the home teams that won in round 1.
home teamname
| away teamname
----------------------+----------------------Queensland Firebirds | Canberra Darters
Sydney Swift
| Adelaide Thunderbirds
Hunter Jaegers
| Perth Orioles
constraints
constraint check_hshomepoints check (homepoints > 0),
constraint check_hsawaypoints check (awaypoints > 0)
constraint validhscity check
(city in ('Canberra', 'Melbourne', 'Hobart', 'Newcastle',
'Sydney', 'Perth', 'Brisbane', 'Wollongong',
'Adelaide', 'Grafton'))
delete cascades
constraint fkhscityid foreign key (cityid) references
hscity (cityid)
on update cascade
on delete cascade
constraint fkhshometeamid foreign key (hometeamid)
references hsteam (teamid)
on delete cascade
on update cascade,
constraint fkhsawayteamid foreign key (awayteamid)
references hsteam (teamid)
on delete cascade
on update cascade,
views
CREATE view hshomepointstable (team, points)
as select teamname, count(*)*2
from hsgame natural join hsdraw, hsteam
where homepoints > awaypoints and hometeamid = teamid
group by teamname;
CREATE view hsawaypointstable (team, points)
as select teamname, count(*)*2
from hsgame natural join hsdraw, hsteam
where awaypoints > homepoints and awayteamid=teamid
group by teamname;
CREATE view hspointstable (team, points)
as select team,
CASE WHEN home.points is null THEN away.points
WHEN away.points is null then home.points
ELSE home.points+away.points
END
from hshomepointstable home FULL JOIN hsawaypointstable away
using (team);