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Questions and Answers
Which notation uses rectangles for entities, ellipses for attributes, and diamonds for relationships?
Which notation uses rectangles for entities, ellipses for attributes, and diamonds for relationships?
- Crow's Foot notation
- Min-Max notation
- Chen notation (correct)
- None of the above
Which notation is known for using graphical symbols to indicate the 'many' side of the relationship?
Which notation is known for using graphical symbols to indicate the 'many' side of the relationship?
- Chen notation
- Crow's Foot notation (correct)
- Min-Max notation
- None of the above
Which notation uses a pair of numbers to represent structural constraints?
Which notation uses a pair of numbers to represent structural constraints?
- Chen notation
- Crow's Foot notation
- Min-Max notation (correct)
- None of the above
Which notation uses rectangles for entities and lines with different shapes to represent relationships?
Which notation uses rectangles for entities and lines with different shapes to represent relationships?
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What is the purpose of representing ERD elements in both Chen and Crow's Foot notations?
What is the purpose of representing ERD elements in both Chen and Crow's Foot notations?
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Study Notes
- Notation is a collection of symbols used for data representation in database design modeling.
- There are different notations for ERD modeling, including Chen, Crow's Foot, and Min-Max notations.
- Chen notation uses rectangles for entities, ellipses for attributes, and diamonds for relationships.
- Crow's Foot notation uses rectangles for entities and lines with different shapes to represent relationships.
- Crow's Foot notation is known for using graphical symbols to indicate the 'many' side of the relationship.
- Min-Max notation is a third ERD notation that uses a pair of numbers to represent structural constraints.
- The minimum number of times an entity can appear in a relation is represented by m, and the maximum is denoted by n.
- The visualizations in the text show how to represent basic ERD elements in both Chen and Crow's Foot notations.
- Choosing which notation to use is typically a matter of personal preference or convention.
- The notations can be mapped to corresponding relational schemas for better illustration.
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