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lbelcher lbelcher
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5 years ago
For the M-O (parent mandatory, child optional) case, what action(s) should be taken to ensure minimum cardinality is maintained?

• Define referential integrity constraint from child to parent

• Make foreign key NOT NULL

• Will require trigger or other application code

• Both Define referential integrity constraint from child to parent and Make foreign key NOT NULL are correct
Textbook 
Database Processing: Fundamentals, Design, and Implementation

Database Processing: Fundamentals, Design, and Implementation


Edition: 15th
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NashuaNashua
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5 years ago
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