Discussion
Each answer below shows example data from a table. Which answer is an example of the multivalue, multicolumn problem?
Answer: A
Correct answer: Three columns have the values 534-2435, 534-7867, and 546-2356 in the same row.
This is the multivalue, multicolumn problem: several values of the same attribute - here telephone numbers - held in a row of separate columns. It fails because the number of columns is fixed while the number of values is not, and because querying across them requires the same condition to be repeated for each. The values belong in a separate table, one row each.
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