Relationships in ER diagrams are graphically represented by:

Question

BlackTom AI · Accepted Answer

In the Chen notation for Entity-Relationship (ER) modeling, relationships are depicted as diamonds that connect entity rectangles.

1) Relevant knowledge points and concepts
- Entities: typically drawn as rectangles and represent real-world objects or concepts (e.g., Customer, Order).
- Attributes: properties of entities, drawn as ovals attached to the entity rectangle.
- Relationships: associations between entities; in Chen-style ER diagrams these are shown as diamonds placed between the entity rectangles and connected by lines.
- Cardinality/constraints: shown on the connecting lines (e.g., 1-to-many) or with symbols depending on notation.

2) Step-by-step reasoning
- Look at each answer option and map it to standard ER diagram notation conventions.
- Option "Ovals connected to entities": matches attributes, not relationships.
- Option "Diamonds linking entities": matches the Chen ER-diagram convention for representing relationships.
- Option "Rectangles with attached attributes": rectangles are entities; they do not represent relationships themselves.
- Option "Circles with constraint letters": not a standard way to represent relationships in common ER notations (constraints usually appear as labels or symbols on lines).

3) Calculations or intermediate steps
- No numerical calculations are needed; the solution is based on recognizing standard diagram symbols and their meanings.

4) Why the correct answer is correct
- Chen’s ER model explicitly uses diamond shapes to denote relationships; diamonds are drawn between entity rectangles and connected by lines to show which entities participate in the relationship. This is the widely taught and accepted graphical convention for relationships in ER diagrams.

5) Why the other options are incorrect
- "Ovals connected to entities" represent attributes, not relationships.
- "Rectangles with attached attributes" describe entities and their attributes, not the relationships between entities.
- "Circles with constraint letters" is not the standard symbol for relationships; constraints are typically shown on connecting lines or with textual annotations, not as circles.

6) Conclusion
- Therefore the correct choice is "Diamonds linking entities," which matches the provided answer.

Relationships in ER diagrams are graphically represented by:单项选择题

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