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Question
A referential integrity constraint policy that guarantees that a row in a parent table always has a required entry in a child table ________.A) is known as a minimum cardinality enforcement action
B) needs to be documented by the database development team
C) is enforced in most DBMS products
D) Both A and B are correct
Answer
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Related questions
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Suppose you have created a data model for an airline based on a variety of forms, reports, user interviews, data sources, etc. Your client comes forward with a new desired report that includes passenger weights and a relationship between passengers and employees, neither of which is in your E-R diagram. You should ________.
A) create a new, separate E-R diagram with just the new information
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ID-dependent entities are a common type of weak entity.
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