“National Electoral Division Profiles” Case Study Vincent Tang High Distinction Assignment, Autumn 2007

Introduction to National Electoral Division Profiles The database refers to the website: pdf pdf ► Holds information about 14 National/Federal Electoral Divisions ► The current/previous members of those divisions ► First Name ► Surname ► Parties the members belong too ► The length of period they are members ’ of the division ► Year Started ► Year Ended ► Contact Details for the State Head Office

ERD

One to Many Relationship – 1:m divisionname| state| size | firstelection| demographic …………………….. | ….. | ….| ……….| …. Prospect| NSW | 159| 1968| Inner Metro Reid | NSW | 62| 1922| Inner Metro Calare | NSW | 21621| 1906| Rural stateabv|buildingno| street | suburb | postcode| areacode| phoneno | faxno NSW | 24| Campbell Street | Sydney | 2000| 2| | VIC | 2| Lonsdale Street | Melbourne| 3000| 3| | QLD | 488| Queen Street | Brisbane | 4000| 7| | WA | 111| St Georges Terrace | Perth | 6848| 8| | SA | 1| King William Street | Adelaide | 5000| 8| | TAS | 86| Collins Street | Hobart | 7000| 3| | NT | 80| Mitchell Street | Darwin | 800| 8| | ACT | | Queen Victoria Terrace| Parkes | 2600| 2| | (8 rows) Division Table StateOffice Table Primary Key Foreign Key State in Division Table is Foreign Key in StateOffice Table

Many to Many Relationship – m:m memid | memfirstname | memsurname | C | Bowen 2 | J | Crosio 3 | R E | Klugman 8 | C | Pearce 9 | PE | Nugent 10 | J | Saunderson 11 | P | Andren memid*| partyabv* | ALP 2 | ALP 3 | ALP 8 | LP 9 | LP 10 | ALP 11 | IND partyabv | partyname ALP |Australian Labor Party IND |Independent LP |Liberal Party of Australia (formed in 1946) Member Table Memberships Table PartName Table

Query: Simple Display Divisions that belong to NSW divisionname | state | size | firstelection | demographic Prospect | NSW | 159 | 1968 | Inner Metro Reid | NSW | 62 | 1922 | Inner Metro Calare | NSW | | 1906 | Rural (3 rows) select * from division where state='NSW';

Query: Natural Join memid | memfirstname | memsurname | partyabv | C | Bowen | ALP 2 | J | Crosio | ALP 3 | R E | Klugman | ALP 4 | L | Ferguson | ALP 5 | T | Uren | ALP 6 | C A | Morgan | ALP 7 | J T | Lang | LANG LAB 8 | C | Pearce | LP 9 | PE | Nugent | LP 10 | J | Saunderson | ALP 11 | P | Andren | IND 12 | D W | Simmons | ALP 13 | A J | MacKenzie | NCP 13 | A J | MacKenzie | NP select * from member natural join memberships; Display everything in both member table and membership table (natural join): - shows the members name and the party they belong in

Query: Cross Product memid | memfirstname | memsurname | memid | partyabv | C | Bowen | 1 | ALP 2 | J | Crosio | 2 | ALP 3 | R E | Klugman | 3 | ALP 4 | L | Ferguson | 4 | ALP 5 | T | Uren | 5 | ALP 6 | C A | Morgan | 6 | ALP 7 | J T | Lang | 7 | LANG LAB 8 | C | Pearce | 8 | LP 9 | PE | Nugent | 9 | LP 10 | J | Saunderson | 10 | ALP 11 | P | Andren | 11 | IND 12 | D W | Simmons | 12 | ALP 13 | A J | MacKenzie | 13 | NCP 13 | A J | MacKenzie | 13 | NP select * from member, memberships where member.memid = memberships.memid; Display everything in both member table and membership table (cross-product): - shows the members name and the party they belong in

Query: Group By state | total TAS | 1 NT | 1 ACT | 1 SA | 1 VIC | 3 WA | 1 QLD | 3 NSW | 3 (8 rows) select state, count(*) as total from division group by state; Determine the total amount of divisions in the each state

Query: Group By & Having state | total VIC | 3 QLD | 3 NSW | 3 (3 rows) select state, count(*) as total from division group by state having count(*) >2; Determine the states with more than 2 divisions

Query: Sub-Query memfirstname | memsurname | divisionname | length J | Crosio | Prospect | 14 T | Uren | Reid | 32 PE | Nugent | Aston | 11 D W | Simmons | Calare | 13 J A | England | Calare | 15 Dr A C | Theophanous | Calwell | 17 R F | Shipton | Higgins | 15 H E | Holt | Higgins | 18 B C | Humphreys | Griffith | 19 D M | Cameron | Griffith | 11 E E | Darling | Lilley | 13 W | Truss | Wide Bay | 16 B P | Hansen | Wide Bay | 13 N | Andrew | Wakefield | 21 D | Williams | Tangney | 11 (15 rows) select memfirstname, memsurname, divisionname, yrend-yrstart as length from member natural join period where yrend-yrstart> (select avg(yrend-yrstart) from period); Display previous members who we’re members for a division greater then the average length

Query: Self Join divisionname | demographic Prospect | Inner Metro Reid | Inner Metro Higgins | Inner Metro Griffith | Inner Metro Lilley | Inner Metro Tangney | Inner Metro Solomon | Inner Metro Denison | Inner Metro Canberra | Inner Metro (9 rows) SELECT d2.divisionname, d2.demographic FROM division d1, division d2 WHERE d1.divisionname = 'Lilley' AND d1.demographic = d2.demographic; Show divisions which are considered the same demographic as Lilley

Action Statement: “CHECK” CREATE TABLE Period ( MemIDINTEGER, YrStartINTEGER NOT NULL, YrEndINTEGER, DivisionNameTEXT, ………………, ………………………, CONSTRAINT di_Period_YrStart CHECK ((YrStart >= 1900) AND (YrStart <= 2500)), ………… ); Output – When constraint is violated INSERT INTO Period VALUES (37,1880,null,'Denison'); ERROR: new row for relation "period" violates check constraint "di_period_yrstart"

“CHECK” Constraints CREATE TABLE Division ( DivisionNameTEXT, StateVarchar(3), SizeINTEGERNOT NULL, FirstElectionINTEGER, DemographicTEXT NOT NULL, …………………, ……………………, CONSTRAINT di_Division_Demographic CHECK (Demographic IN ('Inner Metro', 'Outer Metro', 'Provincial', 'Rural')) ); Output – When constraint is violated INSERT INTO Division VALUES ('Canberra','ACT',1900,1974, ‘Inner'); ERROR: new row for relation "division" violates check constraint "di_division_demographic"

Action Statement: “ON DELETE RESTRICT” To prevent delete in Member Table without deleting data from Memberships Table first CREATE TABLE Memberships (MemIDINTEGER NOT NULL, PartyAbvTEXT, CONSTRAINT MSPK PRIMARY KEY (MemID, PartyAbv), CONSTRAINT MS_MemIdFK FOREIGN KEY (MemID) REFERENCES Member ON DELETE RESTRICT ON UPDATE CASCADE, CONSTRAINT MS_PartyFK FOREIGN KEY (PartyAbv) REFERENCES PartyName ON DELETE RESTRICT ON UPDATE CASCADE); DELETE FROM Member WHERE MemId = 1; ERROR: update or delete on "member" violates foreign key constraint "ms_memidfk" on "memberships" Output – When constraint is violated

Creating a “VIEW” To create a view containing the previous/current members of the division ‘Prospect’ CREATE VIEW Prospect (Id, Surname, FirstName, Start) AS SELECT memid, memsurname, memfirstname, yrstart FROM member natural join period WHERE divisionname = 'Prospect'; id | surname | firstname | start | Bowen | C | | Crosio | J | | Klugman | R E | 1969 (3 rows) select * from Prospect;

Query a “View” id | surname | firstname | start | Bowen | C | | Crosio | J | 1990 (2 rows) select * from prospect where start > 1980; To search the view table ‘Prospect’ for members who started after 1980