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.
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