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In an ER model, how is a one-to-many relationship typically represented?

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Question: In an ER model, how is a one-to-many relationship typically represented?

Options:

  1. With a single line connecting two entities
  2. With a crow\'s foot notation
  3. With a dashed line
  4. With a double line

Correct Answer: With a crow\'s foot notation

Solution: 

A one-to-many relationship is typically represented with a crow\'s foot notation.

In an ER model, how is a one-to-many relationship typically represented?

Practice Questions

Q1
In an ER model, how is a one-to-many relationship typically represented?
  1. With a single line connecting two entities
  2. With a crow's foot notation
  3. With a dashed line
  4. With a double line

Questions & Step-by-Step Solutions

In an ER model, how is a one-to-many relationship typically represented?
Correct Answer: Crow's foot notation
  • Step 1: Understand what a one-to-many relationship means. It means one entity can be related to many entities.
  • Step 2: Identify the two entities involved in the relationship. For example, a 'Customer' and 'Order'.
  • Step 3: In the ER model, draw the first entity (e.g., 'Customer') as a rectangle.
  • Step 4: Draw the second entity (e.g., 'Order') as another rectangle.
  • Step 5: Connect the two rectangles with a line to show the relationship.
  • Step 6: At the 'Order' end of the line, draw a crow's foot symbol (three lines branching out) to indicate many.
  • Step 7: At the 'Customer' end of the line, leave it as a single line to indicate one.
  • One-to-Many Relationship – A relationship where one entity can be associated with multiple instances of another entity.
  • Crow's Foot Notation – A graphical representation used in ER diagrams to depict the cardinality of relationships.
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