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Modelling Basics Value: 25% Due date: 31-Apr-2017 Return date: 27-Apr-2017 Submission method options Alternative submission method Task Overview of business case: Handy-Trady Hire (HTH) is a home repair company that employs several contractors who specialise in different areas. Contractors have a specialisation in any of the following areas: Electrical Cabinet making Landscaping, plumbing Driveway sealing Roof cleaning Interior & Exterior painting HTH started as a small family business and for the past five years has been managing their business activities using an Excel spreadsheet. With view to their expanding business and under the new management, they decided to investigate the option of implementing a database system. Accordingly, they hired you to design a relational database to better track and record their operational data. HTH discovered business rules/constraints for your ERD: A. A customer calls HTH to request a home repair job: Details about the customer and the requested job need to be recorded. (2 marks) B. Each tradesperson specialises in only one trade, and details of their trade and the date acquired need to be kept on record. (2 marks) C. HTH has several trucks (including equipment) and allocates a truck for each tradesperson to do a job. Although some tradespersons have their own truck and equipment and advise HTH about this, so not to be assigned a truck. (2 marks) D. A requested job may require different specialisation depending on the job type – that is, a job may require more than one tradesperson to complete. (4 marks) E. At a later interview with the manager you learnt that HTH appoint one of the tradespersons to supervise others and oversee the work done by the other tradespersons. (1 marks). F. Also HTH wants to keep records of how the customer was referred to them – by what source (ie- TV add, Friend, Internet, etc.) (2 marks). G. Customers have the option to make partial payments for a service, as long as they pay no later than one week after the completion of any service -- Details about each payment relating to a service, amount of payment and date need to be recorded. (2 marks) Your task Create an ERD for each of the above statements that describe the current business rules for HTH. For each new statement being the business rule, extend the ERD to include the additional business rule in the ERD (created in previous point ‑ for example; B will include A&B, C will include A, B & C, etc.) Use Crows Foot notations and include all the following in each part: All entities with Primary key and any foreign key attributes; The relationships between entities; The cardinality and optionality of each relationship; Any M:N relationships are be resolved to 1:M relationships Rationale This assessment item is designed to test your understanding of basic database design and modelling concepts and your ability to interpret business rules into an Entity Relationship Diagram. Additionally, your ability to apply correct relationships, constraints, cardinalities/optionality and the use Crows Foot modelling notations are tested. Marking criteria The marking criteria for this assignment are: ERD created using Crows Foot Notation and shows all entries, PK and FK/s, attributes, relationships, cardinality, and optionality. HD DI CR PS FL Comprehensive and accurate ERD that contains all entities, PK and FK, attributes, associative entities included if required, all relationships shown and identified with correct cardinality and optionality Detailed and accurate ERD that contains all entities, PK and FK, attributes, associative entities included if required, all relationships shown and identified with correct cardinality and optionality Thorough and reasonably accurate ERD that contains all entities, PK and FK, attributes, associative entities included if required, all relationships shown and identified with correct cardinality and optionality Adequate ERD that contains most entities, PK and FK, attributes, associative entities included if required, all relationships shown with cardinality Incomplete or irrelevant ERD that contains some entities, relationships, and cardinality Presentation This assessment item is required to be submitted in Word format (.doc, or .docx). All screenshots that are required should be captured and inserted into the document in the appropriate position to show that you have completed the requirement. Screenshots that are submitted in addition to the assignment document will not be marked.

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Description: A Local Real Estate (LRE) company sells houses. Sellers who want to sell their houses sign a contract with LRE and provide information on their house. This information kept in LRE's internal database. The internal database is used by the real estate agents working for LRE to sell houses ...

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Task 1   Draw and present a dependency diagram for the table above, including transitive dependencies. In your oral presentation, you need to explain each dependency.   Task 2    If the table above is not in the first normal form, normalise it so that it is in the first n ...

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This assignment should be presented in a report format, including the following items: • An ER Diagram with all entity names, attribute names, primary and foreign keys, relationships, cardinality and participation indicated. All many to many relationships should be resolved. • A discussion ...

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Question: Having established the online transaction processing database, Ms. Heritage wants more intelligence information from the available data and she is looking for a potential data warehouse for MT. As the first step in this process, she expects to setup a data mart for ticket sales as the fir ...

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