A one-to-many relationship between two entities is symbolized in a diagram by a line that ends with:

Question

BlackTom AI · Accepted Answer

In crow’s-foot entity–relationship notation the “many” side is drawn as a three-pronged fork (a crow’s foot), so a one-to-many relationship is indicated by a line that ends with a crow’s foot.

1) Relevant knowledge points and concepts
- Crow’s-foot notation is a common ER diagram convention. The forked (three-pronged) symbol denotes “many.”  
- The opposite “one” side is typically shown with a single straight bar or short mark; optionality is shown with a circle (0) or a combination of circle and bar. Other diagramming conventions (Chen, UML) use textual multiplicities (1, N, 1..*, etc.) rather than a fork symbol.

2) Step-by-step reasoning
- The question asks what symbol at the end of the relationship line represents the “many” side.  
- In crow’s-foot ER diagrams, the many side uses the crow’s-foot symbol. Therefore the line should end with a crow’s foot.

3) Intermediate steps (notation mapping)
- “One” side: single straight bar or short mark (|) — indicates exactly one.  
- “Many” side: crow’s foot (three-pronged fork) — indicates many (N).  
- Combined, a one-to-many relationship is shown by having the crow’s foot at the many end of the relationship line.

4) Why the correct answer is correct
- The crow’s foot is the established visual convention for “many” in crow’s-foot ER diagrams, so a one-to-many relationship uses that symbol on the appropriate end.

5) Why other options are incorrect
- “With a crow’s foot preceded by a short mark.”: implies a composite symbol and is not the standard simple depiction for one-to-many (it would confuse one/many and optionality).  
- “Two short marks.”, “one short mark.”, “three short marks.”: these do not match the standard crow’s-foot representation; single or pairs of short marks are not how “many” is depicted in crow’s-foot notation.

6) Conclusion
- The correct representation is with a crow’s foot. This matches the provided answer: "with a crow's foot."

A one-to-many relationship between two entities is symbolized in a diagram by a line that ends with: 单项选择题

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