When using the Crow's Foot notation, the associative entity is indicated by solid relationship lines between the parents and the associative entity.
The Crow's Foot notations was developed in 1976 by Gordon Everest.
In the Crow's Foot diagram, physical entities are represented by boxes while the lines between the boxes denotes relationships.
Note: A physical entity refers to a real-world object such as:
Furthermore, a physical entity is typically represented with a rectangle containing the physical entity's name in the Crow's Foot notations.
Also, solid relationship lines are used to indicate the associative entity with respect to the relationship between the parents and the associative entity
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