Unary relationships are common in manufacturing industries.
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Q4: Connectivities and cardinalities are established by concise
Q6: The existence of a mandatory relationship indicates
Q9: A weak entity has a primary key
Q10: The Crow's Foot notation is less implementation-oriented
Q11: In Chen notation, there is no way
Q12: A weak relationship exists if the primary
Q13: A composite identifier is a primary key
Q15: In the entity relationship model, a table
Q19: Software vendors have adopted the Chen representation
Q20: In implementation terms, an entity is existence-dependent
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