ITECH2004 Data Modelling:SQL Database Design and Implementation

ITECH2004 Data Modelling:SQL Database Design and Implementation

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ITECH2004 Data Modelling

Question:

SQL Database Design and Implementation 

Purpose and Learning Outcomes Purpose

The purpose of the assignment is to provide students with the opportunity to apply knowledge and skills developed during the semester with particular reference to:

1. Interpretation of business rules from a case study;

2. Conceptual data modelling through the creation of an Entity Relationship(ER) model;

3. Application of DDL and DML components of SQL to:

a. create and populate a relational database; and

b. query the created relational database. Learning Outcomes

The learning outcomes directly assessed are:

Knowledge:

K4. Design a relational database for a provided scenario utilizing tools and techniques including ER diagrams, relation models and normalization

K5. Describe relational algebra and its relationship to Structured Query Language (SQL).

Skills:

S1. Interpret entity-relationship diagrams to implement a relational database.

S2. Demonstrate skills in designing and building a database application using a commercially available database management system development tool.

S3. Use a query language for data manipulation.

Case Study – Appliance Deliveries System

An online retailer, AppliancesToYourDoor sells whitegoods e.g. refrigerators, washing machines and ovens and other electrical appliances over the phone and the World Wide Web. They need a system that handles the delivery of purchased goods to customers. They need to understand the data storage requirements for this system. AppliancesToYourDoor have distribution warehouses in each of the states of Australia (the South Australia warehouse looks after the Northern Territory and the NSW warehouse looks after the Australian Capital Territory). The warehouse is usually located in an industrial sector on the outskirts of the state capital. For example the warehouse for Victoria is located at an address in Laverton North.

Each warehouse has a unique id, one or more managers, address (two address lines, suburb and state (postcode is obtained from these), email address, phone number and other information is also kept about capacity space (in square metres), occupied space (in square metres), number of loading bays, number of access points/doors and a general description for any other interesting information. Information is additionally kept about the manager/s e.g. title, highest qualification obtained and date of that qualification. As well as managers, the warehouses also have other employees – workers, drivers and jockeys (assistants). The workers pack vans for delivery of whitegoods and unload and store warehouse deliveries. All workers must be a licenced vehicle driver (the licence number and expiry date are kept on file) and also have a licence to drive forklifts and the forklift licence number and expiry date are also kept on file. All drivers have a driver’s licence and a record of any endorsement to drive certain vehicles.

As well as their driver’s licence number and expiry date, the highest endorsement level and the endorsement expiry date are kept on file. A driver is able to drive a delivery vehicle with a Gross Vehicle Mass (GVM) that is equal to or less than his endorsement level. All jockeys have certificate qualifications that allow them to correctly install appliances. The certificate title and year awarded is kept on file for jockeys. Jockeys assist the driver in delivering and installing the delivered appliance. Sometimes jockeys also drive, but only in emergencies. Their driver’s licence number and expiry date must also be kept on file. For all employees, a record is kept of their employee id, first name, last name, contact phone, contact email, start date, termination date and as noted above, driver’s licence number and expiry date. Each warehouse has a fleet of transport vehicles. These can range from 4.5 tonne trucks to small 1 tonne vans.

All vehicles are identified by their registration number and information is also kept about their type, seating capacity, carrying capacity (the tonnage GVM already mentioned e.g. 4.5 tonnes), kerb mass/weight (the tare mass with a full tank of petrol i.e. the weight of an empty vehicle ready to be loaded), load space in cubic metres, maximum load area height, maximum load area width, maximum load area depth and status (e.g. “Being Loaded”, “Ready for Delivery”, “On Delivery”, “In Service”).

 To make a purchase through AppliancesToYourDoor, it is necessary to sign up and create a customer account. Information kept about a customer includes customer id, first name, last name, phone, email and address (2 lines of address, suburb and state (postcode is obtained from these). For a delivery to be made a customer must have a paid invoice for the goods in question. An invoice is made up of a header record containing invoice id, date, customer id and payment status (T/F). Each line item of the invoice contains a product id, product description and sold price. Other information kept on the product includes product type code (e.g. “RF” for refrigerator, “WM” for washing machine, “TV” for television), unpacked and packed dimensions (height, width, depth) and packed and unpacked weight (in tonnes). After a customer has ordered and successfully paid for their item/s, their invoice is complete and one or more delivery requests are created. The delivery request is made up of one or more of the items on the invoice.

For example, Mr. Smith may have paid for 2 refrigerators and a washing machine. These would be recorded as three separate line items on the invoice. He may want one refrigerator to be delivered to his mother who lives at an address in Sydney, and the other two items, refrigerator and washing machine delivered to his home address in Melbourne. The refrigerator delivery to his mother would be allocated to and handled by the Sydney warehouse and the Melbourne warehouse would be allocated and handle the delivery to his address. The delivery request has a unique id, request date, requested delivery date, actual delivery date, delivery address (2 lines of address, suburb and state (postcode is obtained from these)), contact name, contact phone number, delivery warehouse id and delivery instructions.

For the purposes of obtaining postcodes, a record is kept of the postcode attached to the suburb and state. Additionally, for obtaining road distances between these locations, a record is kept of the distances between each suburb and state combination so that the road distance from the warehouse to the delivery location can be obtained and the road distance between a suburb and state combination and another suburb and state combination can also be obtained.

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