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Questions and Answers
What is the purpose of a foreign key in a one-to-one relationship?
In a recursive one-to-many relationship, each instance of an entity is related to:
What is the main characteristic of mutually exclusive relationships?
When implementing arc relationships, where should foreign keys be placed?
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What is a characteristic of subtype entities in supertype-subtype relationships?
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In super/subtype entities, why are subtypes considered mutually exclusive?
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What is a common challenge that designers and users face in conceptual models according to the text?
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Which type of relationship ensures that only one foreign key is inserted when a record is created?
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'Supertypes and Subtypes' involve which kind of relationships?
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'Connection Traps' in conceptual models arise due to:
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Study Notes
- Students may not always get their preferred project and can be assigned one based on their course.
- Regular meetings with supervisors are required, each recorded with outcomes, next meeting date, and work needed.
- Module leader wants a monthly report on meeting attendance to identify absentee students.
- Assignments in the module have descriptions, weightings, and deadlines, with submissions recorded along with grades.
- End-of-semester report will show overall grades for each student.
- Students register for three project choices, rank them, and a project is allocated based on their preferences.
- Concepts covered include recursive, mutually exclusive, supertype and subtype relationships.
- Arc relationships are mutually exclusive with shared relationship names and cardinality.
- Tables for implementing arc relationships require foreign keys and check constraints.
- Supertype entities have parent-child relationships with subtype entities.
- Subtypes are specializations of supertypes with common attributes inherited.
- Connection traps in conceptual models can arise from misinterpretation of relationship meanings.
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Description
Test your knowledge on allocation of projects in ISDB course and the importance of holding regular meetings with supervisors. Explore scenarios related to project allocation, student-supervisor meetings, and recording meeting outcomes.
