For each FD X→Y, either X is superkey or Y is prime. Check B→D: B not superkey but D is prime → OK. All FDs satisfy → 3NF .
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The Elmasri Navathe database system solution manual is a companion guide to the textbook "Database Systems: A Practical Approach Using SQL" by Elmasri and Navathe. The solution manual provides detailed solutions to all the exercises and problems presented in the textbook. It is designed to help students understand the concepts and techniques presented in the textbook and to provide a way for them to check their work and progress. Lucas paused
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He erased his messy diagram and started over. This time, he didn't guess. He understood the cardinality ratios. He drew the diamond for the relationship, wrote the cardinality (1:N), and defined the participation constraints. Total participation. Partial participation. The pieces clicked into place like a mechanical lock.