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Questions and Answers
Which phase involves the mapping of the conceptual data model to a logical data model?
Which phase involves the mapping of the conceptual data model to a logical data model?
- Phase 2: Conceptual Design
- Phase 4: Physical design
- Phase 1: Requirements collection and analysis
- Phase 3: Logical design (data model mapping) (correct)
What is used to represent the structural constraints on a relationship in the Entity-Relationship (ER) Model?
What is used to represent the structural constraints on a relationship in the Entity-Relationship (ER) Model?
- Cardinality ratio and Participation Constraints (correct)
- Entity Types and Entity Sets
- Null Values and Attributes
- Weak Entity Types
In which design phase do we interview prospective database users to understand and document their data requirements?
In which design phase do we interview prospective database users to understand and document their data requirements?
- Phase 3: Logical design (data model mapping)
- Phase 1: Requirements collection and analysis (correct)
- Phase 2: Conceptual Design
- Phase 4: Physical design
Which type of constraint specifies whether the existence of an entity depends on its being related to another entity?
Which type of constraint specifies whether the existence of an entity depends on its being related to another entity?
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In which phase of design do we focus on the physical implementation of the database?
In which phase of design do we focus on the physical implementation of the database?
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Study Notes
Database Design Phases
- The logical design phase involves the mapping of the conceptual data model to a logical data model.
- In the requirements gathering phase, we interview prospective database users to understand and document their data requirements.
Entity-Relationship (ER) Model
- Structural constraints on a relationship in the ER Model are represented using cardinality constraints.
- A existential constraint specifies whether the existence of an entity depends on its being related to another entity.
Physical Design Phase
- The physical design phase focuses on the physical implementation of the database.
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