WebQuestion 1: Given a relation R( P, Q, R, S, T, U, V, W, X) and Functional Dependency set FD = { PQ → R, QS → TU, PS → VW, and P → X }, determine whether the given R is in … WebJan 24, 2024 · A → BC CD → E B → D E → A Which of the following is a combination of two candidate keys for R? Answer Choice: a) A and E b) B and C. c) B and D d) C and D . The Correct Answer is a) A and E. But if E depend on A ( E → A), then why option a) A and E is correct? please help
normalization - Is a relation R(A,B,C) with functional dependencies …
WebThe Chase – (2) • Start by assuming t = abc… . • For each i, there is a tuple s i of R that has a, b, c,… in the attributes of R i. • s i can have any values in other attributes. • We’ll use the same letter as in t, but with a subscript, for these components. WebChapter 11 Functional Dependencies Adrienne Watt. A functional dependency (FD) is a relationship between two attributes, typically between the PK and other non-key attributes within a table.For any relation R, attribute Y is functionally dependent on attribute X (usually the PK), if for every valid instance of X, that value of X uniquely determines the value of Y. new pharmacy accredited ontario
candidate keys from functional dependencies - Stack …
http://openclassroom.stanford.edu/MainFolder/courses/cs145/old-site/docs/backup/reldesign-exercises.html WebBC → D CD → E DE → A (a) Specify all minimal keys for R. (b) Which of the given functional dependencies are Boyce-Codd Normal Form (BCNF) violations? (c) Give a decomposition of R into BCNF based on the given functional dependencies. (d) Give a different decomposition of R into BCNF based on the given functional dependencies. 15. intro to renewable energy