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COIT20247 Database Design And Development

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Question:

In this assignment, you need to create an Entity Relationship (ER) diagram relevant to the above case study and optionally perform logical design to produce appropriate 3NF Relations.The attributes for various entities have not been purposely described in the case study so that the students are encouraged to further research and list the pertinent attributes in addition to the required identifier for each and every entity in their ERD.

1 Draw an appropriate ER diagram
Use the symbols as prescribed in your unit-textbook to draw the ER diagram (ERD) for the above case study.
Your ERD must
• show all necessary entities, attributes and relationships
• show identifiers/identifying attributes as necessary
• show multi-valued attributes, if any
• show participation and cardinality
• show associative entities, if appropriate
• show weak entities, if any
• use the notation described in the set text
• use consistent and appropriate naming for entities and attributes as specified in the unit text book.

Some business rules or other aspects of the case study may not be clear to you when you read the case study. If this is the case, then you should either approach your lecturer or tutor for clarification, or you may simply make an assumption and then develop your ERD accordingly. For example, the case study might not mention all relevant participation information (also called minimum cardinalities). If so, you may make an assumption about what the minimum cardinalities might reasonably be, and then show them in your ERD accordingly.
 
You should justify each assumption in terms of the business, for example: in the case study regarding the E-R model for customers placing an order it is assumed that each customer must have at least one order because it is assumed that the business does not record customer details until the customer.places an order. To get yourself started, ask yourself, 'If I were running this business,what things I need to keep a list of?' Write those things down. For each thing, what information would you need to record aboutit? How can it be identified? The answers to these questions will help you to develop your ERD.
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