Podcast
Questions and Answers
What is the relationship type between Student and Course?
What is the relationship type between Student and Course?
- M:M (correct)
- 1:M
- 1:1
- M:1
Which of the following attributes belongs to the Instructor entity?
Which of the following attributes belongs to the Instructor entity?
- grade
- course ID
- salary (correct)
- major
What does the term 'cardinality' refer to in the context of relationships between entities?
What does the term 'cardinality' refer to in the context of relationships between entities?
- The process of defining entities
- The number of instances of one entity related to another (correct)
- The unique identifier of an entity
- The type of attributes an entity can have
In what phase of database design is the Entity-Relationship Diagram (ERD) typically created?
In what phase of database design is the Entity-Relationship Diagram (ERD) typically created?
Which entity would you expect to contain the attribute 'name'?
Which entity would you expect to contain the attribute 'name'?
What kind of relationship exists between Course and Section?
What kind of relationship exists between Course and Section?
Which phase comes directly after the Analysis phase in database design?
Which phase comes directly after the Analysis phase in database design?
Which of the following relationships is described by '1:M'?
Which of the following relationships is described by '1:M'?
Flashcards
Analysis Phase
Analysis Phase
The initial step in database design that involves identifying what elements (entities) will be stored and their properties (attributes).
ERD (Entity-Relationship Diagram)
ERD (Entity-Relationship Diagram)
A representation of data and their relationships in a database. It's like a blueprint for how data is structured.
Cardinality
Cardinality
A fundamental concept in database design, describing how many entities are involved in a particular relationship.
Entity
Entity
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Attribute
Attribute
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Relationship
Relationship
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Instance
Instance
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Schema
Schema
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Study Notes
Database Design Steps
- Analysis is the first step in database design
- Analysis includes:
- Identifying entities
- Defining attributes for each entity
- Establishing relationships between entities
Entity Relationship Diagram (ERD)
- ERD visual representation of entities and relationships
- Entities are represented as rectangles
- Attributes are represented as ovals connected to the entity
- Relationships are represented by lines connecting entities
Relationships
- Relationships are categorized by cardinality
- 1:1 (one-to-one)
- 1:M (one-to-many)
- M:M (many-to-many)
- Example relationships:
- Student to Course (M:M)
- Instructor to Department (1:1)
- Department to Course (1:M)
- Course to Section (1:M)
Attributes
- Attributes define characteristics of an entity
- Attributes are represented in ovals connected to entities
- Example attributes:
- Student: name, major, grade, ID
- Course: name, ID, description
- Instructor: name, ID, salary
Entities
- Entities represent real-world objects
- Example entities:
- Student
- Course
- Instructor
- Department
- Section
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