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Posts: 108
2 months ago
What is the multivalue, multicolumn problem, and why is it a problem? Include an example.
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Database Processing: Fundamentals, Design, and Implementation
Edition: 15th
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The multivalue, multicolumn problem occurs when a table uses multiple columns to store multiple values of an attribute. For example, a database of dog owners might have a table with the structure:

DOG_OWNER (OwnerID, LastName, FirstName, DogName01, DogName02, DogName03)

This is a problem because (1) the number of DogNames is fixed, and (2) this structure creates query problems. In fact, this structure is another form of the multivalued dependency, and requires a similar solution: a DOG table should be created to store the DogNames and with a foreign key to link the dogs to their owner.
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