1 votes 1 votes How is A answer? Databases lossless-decomposition databases dependency-preserving database-normalization + – amitqy asked Apr 7, 2019 amitqy 1.0k views answer comment Share Follow See 1 comment See all 1 1 comment reply Sandy Sharma commented Apr 12, 2019 reply Follow Share I think answer should be c 0 votes 0 votes Please log in or register to add a comment.
Best answer 5 votes 5 votes Lossless: B is the intersection between two tables and B is the key in table 2. Dependency preserving : FD on R1 : A -> B FD on R2 : B->D and D -> BC union of these two can cover original FD set. Hence dependency preserving. tusharp answered Apr 12, 2019 • selected Apr 13, 2019 by amitqy tusharp comment Share Follow See all 2 Comments See all 2 2 Comments reply anshul109 commented Jan 12, 2021 reply Follow Share I think there is a mistake in the question as in the first FD A->D, there should be A->B. Isn’t it? 0 votes 0 votes Varun Raj Akula commented Mar 13, 2022 reply Follow Share A->B fd is not in question. how did you do that? Can anyone please explain where the given decomposition is dependency preserving or not. 0 votes 0 votes Please log in or register to add a comment.