Q7. Consider a database containing two relations: R(A,B,C) and S(D,E,F). For each of three (your choice) of the 12 rewriting rules for relational algebra expression, give an example pair of relational algebra expressions involving R and S such that the rule rewrites one expression to the other expression, and give another example pair to show the rewriting rule cannot be used since some of the conditions for the rule are not satisfied.

Q: So SQL does not suppor functional depency constraints. However, if the database system supports…

A: Step1:Functional dependency is a constraint the relationship between attributes in a relation.…

Q: Database Systems For each part of this problem you will need to construct a single SQL query which…

A: Answer is given below

Q: Consider a relation r(A, B, C), with an index on attribute A. Give an example of a query that can be…

A: Example: Consider a relation r(A,B,C) holding an index on attribute “A”. The query plans that only…

Q: Given the following relation: R (A, B, C, D, E, F, G) The functional dependencies that apply onto R…

A: The question is on database normal forms and functional dependencies.

Q: Answer the following questions about the relation R(a, b, c, d, e, f), with functional dependencies:…

A: Answer : R(a,b,c,d,e,f) a->f ab->cd c->e de->b bf->ae It  not violate any normal…

Q: Given a relation R(F, G, H, I, J, K) and functional dependencies: • G-> FI • H> JK The candidate key…

A: Refer to step 2 for the answer.

Q: Consider a relation R={A,B,C,D,E,F,G,H,I} with the set of functional dependencies and determine,…

A: Now we must determine the above definition whether for each FD. Each value is super key or not on…

Q: Consider a relation R={A,B,C,D,E,F,G,H,I} with the set of functional dependencies and determine,…

A: The relation schema R is in a (BCNF) with respect to a set F of FDs if, and only if, for each FD X→Y…

Q: Given a relational schema, R(A, B, C), and set of functional dependencies over R, F = {A → B, AB →…

A: a)A is not the super key, hence it does not represents the relation uniquely The super key will be…

Q: Given a set of FDs for the relation schema R(C, A, N, D, Y) with the candidate keys (CN), (DN)). •…

A: Functional Dependency It is a constraint that determines the relation of 1 attribute to some other…

Q: Consider a relation with schema R(A,B,C,D,E,G) and functional dependencies (FDs) C→D; B→A; D→E; E→G…

A: Answer is given below .

Q: For relation (R), its attributes and its functional dependencies (F): R(A, B, C, D, E) CD-> B A- D…

A: A relational schema R is considered to be in Boyce–Codd normal form (BCNF) if, for every one of its…

Q: Consider the relation scheme R = {A, B, C, D, E, F, G, H} with the following set of functional…

A: I have given an answer in step 2.

Q: Consider the following set F of functional dependencies on the relation schema(A, B, C, D, E, G):A →…

A: The given set of functional dependencies are: (A, B, C, D, E, G):A → BCDBC → DEB → DD → A  Now, we…

Q: Question 3 Consider a relation A(P, Q, R, S, T) with following functional dependencies. i.Р— QR ii.…

A: Relation: f a purposeful dependency X->Y holds true whereverY isn't a set of X then this…

Q: Consider the relation scheme R = {A, B, C, D, E, F, G, H} with the following set of functional…

A: Candidate keys are the set of smallest essential attributes that can generate all the values in the…

Q: You are given the following set of functional dependencies for a relation R= (A, B,C,D,E,F), F= (AB…

A: A) The functional dependency are AB->C DC->AE E->F The key for the given relation is set of…

Q: Given relations P and Q, both over attributes A and B, write a query in relational algebra under bag…

A: Q is always contained in the answer to P.

Q: Consider a relation R(A,B,C,D,E) with functional dependencies AB→C, A→D, and D→E.    What are the…

A: Primary key = AB as we can see in closure that we can find every attribute using AB

Q: Generate a set of relations and functional dependencies which IS in BCNF, but IS NOT dependency…

A: BCNF decomposition may not always be possible for dependency preserving. For example a relation R…

Q: Consider a relation schema R = {A, B, C, D, E, F, G} with the following set of functional…

A: A relation Schema of the set of functional dependencies

Q: For relation (R), its attributes and its functional dependencies (F): R(A, B, C, D, E) C D → B A…

A: A relational schema R is considered to be in Boyce–Codd normal form (BCNF) if, for every one of its…

Q: Consider a relation T with seven attributes ABCDEFG where AB is a composite primary key for T.…

A: Given the relation relation T with seven attributes ABCDEFG where AB is a composite primary key for…

Q: Consider a relation with schema R(A,B,C,D,E,F,G). Choose the key for the relation for the following…

A: According to the question we need to consider a relationship with schema R(A, B, C, D, E, F, G).…

Q: Consider a relation schema R = {A, B, C, D, E, F, G} with the following set of functional…

A: A relational schema R with the set of functional dependencies

Q: Consider the following set F of functional dependencies on the relation schema (A, B, C, D, E, G):…

A: Given a set of functional dependencies on a relational schema and we need to give a BCNF…

Q: Problem 1 Convert the following relation to 2NF, and then to 3NF. Show both conversions. (h, n, c,…

A: 2NF: A relation is in 2NF if it is already in 1NF and all functional dependencies should be full…

Q: Consider the following set F of functional dependencies on the relation schema(A, B, C, D, E, G):A →…

A: The original relation is r(A,B,C,D,E,F). This relation is not BCNF due to the first functional…

Q: Problem 1 Convert the following relation to 2NF, and then to 3NF. Show both conversions. (h, n, c,…

A: In this question, first, we find the 2NF. In 2NF, for relations where the primary key contains…

Q: Consider the following relation T: T( A, C, F, G, K, L) Key of relation T is AF Suppose the…

A: We are given a relation T with FDs. We have to check whether relation is in 3NF or not and if not…

Q: Consider a relation R(A,B,C,D,E) with functional dependencies AB→C, A→D, and D→E. (a) What are…

A: (A ) keys for relation R) is AB   Reason : -- because key is column or set of columns using that you…

Q: In the BCNF decomposition algorithm, suppose you use a functional dependency α → β to decompose a…

A: Since the given relation r(α, β, γ) is broken into relations, r1(α, β) and r2(α, γ), using the…

Q: Consider a relation R(A,B,C,D,E) with functional dependencies AB→C, A→D, and D→E.   (a)  What are…

A: In given question, we have asked the key for given Relation R and closue of A and closure of AC. Key…

Q: Suppose you are given a relation R=(A,B,C,D,E) with the following functional dependencies:…

A: Given Suppose you are given a relation R=(A,B,C,D,E) with the following functional dependencies:…

Q: Consider the relation R = (A, B, C, D, E, F, G, H, I, J} and the set of functional dependencies F…

A: For this problem, we must get all the keys. For this, we must check all the attributes which are…

Q: For a relation named X with attributes (A. B, C, D, E, E), where the primary key of X = { A, C, F },…

A: 4NF data base i given below

Q: bu are given the following set of functional dependencies for a relation R= (A , B C,D,E,F), F=…

A: Key of relation,relation in BCNF and dependency preserving decomposition

Q: Consider the relation schema R(A, B, C, D, E, F) and the set S = {AB->C, BC->AD, D->E, C->B) of…

A: ANSWER:-

Q: Q2: Given relation R with attributes (A, B, C, D, E, F). Give all the keys of R if the functional…

A: Given relation R(A, B, C, D, E, F)   Functional Dependencies: AB → C,  CD → E,  E → F   A, B, D do…

Q: Consider a relation schema R = {A, B, C, D, E, G} and its functional dependency set F = {A → BCD,BC…

A: Given: R = {A, B, C, D, E, G} F = {A → BCD, BC →DE, B → D, D → A}   B+ is basically a closure of B.…

Q: Consider the unnormalized relation R with six attributes ABCDEF and the following functional…

A: Objective: A relation R is given with 6 attributes ABCDEF along with functional dependencies as: AB…

Q: QUESTION 26 Consider a relation R(A B, C, D, E) with the following dependencies: AB-C, CD-E. DEB how…

A: Dear Student, A key is a candidate key if it's the minimum length key that can derive each…

Q: Consider a relation schema R = {A, B, C, D, E} and its functional dependency set F = {A → BC,CD →…

A: The given relation is lossless-join decomposition and not dependency preserving. Hence, correct…

Q: Give a set of FDs for the relation R (ABCD) with AB as primary key under which condition R is in 2NF…

A: Solution :  Given schema  R (ABCD) with AB as primary key If R has to be in 2NF, but not in 3NF then…

Q: Consider the employee database of Figure 4.12. Give an SQL DDL definitionof this database. Identify…

A: Given:- Consider the employee database of Figure 4.12. Give an SQL DDL definitionof this database.…

Q: Task 4: Consider the relation schema R(A, B, C, D, E) with the following FDs FD1: {A,B,C} → {D,E}…

A: A)  A relation is said to be in BCNF if all it's functional dependency is of form X->Y where X is…

Q: Will functional dependencies be preserved if a relation is converted to a temporal relation by…

A: Answer: Functional dependencies might be violated when a relation is enlarged to incorporate a time…

Q: The division operator of relational algebra, “÷”, is defined as follows. Let r(R)and s(S) be…

A: a. Find the ID of every student which has taken all Computer Science Courses: π ID(π ID,course_id…

Q: The division operator of relational algebra, “÷”, is defined as follows. Let r(R)and s(S) be…

A: Given: The division operator of relational algebra, “÷”, is defined as follows. Let r(R)and s(S) be…

Q: QUESTION 9 A relation R(M, N, O, P, Q) is in 2NF and has the following functional dependencies: • MN…

A: Dear Student, As MN derives O and O derives P and also Q thus MN derives M,N,O,P,Q. Thus MN is a…