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4. Two business rules used in ER or other database design tools are 'at least one' and 'at most one', e.g. an employee can work
4. Two business rules used in ER or other database design tools are 'at least one' and 'at most one', e.g. "an employee can work in at most one department". (a) When translating a design into an RDBMS, which of these business rules is easier to implement with normal database constraints? Give examples to show why one of these rules is 'easy' and the other is 'hard'. (b) discuss how database triggers can help with the 'hard' type of business rule
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