bcnf - Bcnf lossless join

Question

Are all relations in bcnf provide lossless join or can any relation be bcnf but not lossless join at the same tiem?

Is there a way to show that a relation that is not in bcnf but NOT lossless join.

Answer 1

3.5NF への分解が依存関係を維持しないスキーマがあります。例については、 (Tsou 1982)を参照してください。