
Consider the following FD set on a relation E with six attributes: F, R, I, D,...
Consider a relation R with 5 attributes M, O, N, E, Y. You are given the following dependencies: M-> N O -> M Y -> E NM ->Y Its candidate keys are {( O)}. 1. Which of the following is a prime attribute for the relation R? _________________ i.M ii.E ii.O iv. All attributes of the relation R are prime attributes 2. Which of the following is true about the given functional dependencies in the relation R? ______________ i.M ->...
Consider the following relation: R(A,B,C,D,E) The following set of functional dependencies are ture on the relation R: FD: AB -> E, E -> D, AD -> C Which of the following sets of attributes does not functionally determine C? AC ABE BD AE AB
Consider the relation R with attributes: A, B, C, D, E, and F Let S be a set of functional dependencies in R such that S = { A-> B, CD-> E, C-> D]. Which of these attributes are in the closure of [C, F)?
2. (15 points) Consider a relation with schema R(A,B,C,D) and FD= { AB->C, C->D, D- >A), what are the keys of R? Hint: Consider the 15 possible non-empty subsets of attributes. First check if a set of attributes X in R is a super key of R. If X-> R then X is superkey of R. Then X is a super key and no subset of X is a super key, then X is a key - a minimum super...
Question 1: Functional Dependencies [7 marks Consider a relation R on attributes (A, B, C, D, E, F,G, H) and the following functional dependen- cies. B →G C →D DE →GC → EF DEF → H (a) What is the closure of [F, G, Hy? (b) List all of the candidate keys of R under the dependencies above. (c) List all of the FDs above that are 3NF violations (d) List all of the FDs above that are BCNF violations....
Here's a relation (R), its attributes and its functional dependencies (F): R(A, B, C, D, E) C D → B A → D D → C E → C What is the closure of AB ({AB}+)? What is the closure of F (F+)? [ set of closures for all LHS][each LHS on one line] What is the minimal set (cover) for F? Provide a key for relation R (a minimal set of attributes that can determine all attr.) Decompose the...
Dependency Very Good dependency (key dependency) : XA where Table Very good If all dependencies in a table are '"very good", the table is in BCNF X is a candidate key Good Good dependency: X-> A where If all dependencies in a table are "very good" or "good", the table is in 3NF X is not a candidate key X is a part of a candidate key A is prime attribute Bad Bad dependency (Transitive Dependency): X A where If...
Consider a relation R with ve attributes A, B, C, D, and E. You are given the following functional dependencies: A->B, BC->E, and ED->A. (a) List all keys for R. (10 points) (b) Is R in BCNF? If it is, explain why. If is not, decompose it into a collection of BCNF relations. (20 points) (c) Is R in 3NF? If it is, explain why. If it is not, convert it into a collection of 3NF relations. (20 points)
Consider the relation R(A, B, C, D, E), where it is known that the only keys are {A, C, D} and {D, E}: Give a set of functional dependencies that will make {A, C, D} and {D, E} be the only keys of R. This set should be such that if you delete any FD, then the keys of R will be something other than {A, C, D} and {D, E}.
Consider a relation R with five attributes A, B, C, D, and E. You are given the following functional dependencies: A → B, BC→E, and ED→A. (a) Is R in BCNF? If it is not, decompose it into a collection of BCNF relations. 2: BCNF and 3NF (3 points) Consider the relation schema R with attributes A, B, C, and D and the following functional dependencies: AB→C, AC→B, B→D, BC→A. (a) Is R in BCNF? If it is not, decompose...