In the entity relationship model, a table row corresponds to an entity instance.
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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
Q14: In the Chen and Crow's Foot notations,
Q16: Composite attributes make it easier to facilitate
Q17: To implement a small database, a database
Q18: In a 1:M relationship, to avoid the
Q19: Software vendors have adopted the Chen representation
Q20: In implementation terms, an entity is existence-dependent
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