Which one of the following symbols is not used in an ERD?

More Questions from ER Model and Business Rules

• A supertype/subtype hierarchy is which of the following?
• A subtype discriminator is which of the following?
• Use of a supertype/subtype relationship is necessary when which of the following exists?
• Inheritance is which of the following?
• When an entity instance must be a member of only one subtype, it is which of the following?
• A rectangle represents which of the following in an EER?
• Specialization is which of the following processes?
• Which of the following statements concerning business rules is true?
• Overlapping and disjoint subtypes have different approaches on how the subtype discriminator is applied.
• There is cardinality on an EER between the supertype and subtype.

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