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: Consider the relation schemas R(A,B) and S(A,B). Suppose {A } is the key for R and also the key for…

A: Even though {A} is the key for both R and S, the union of R and S has the complete keyset, so here…

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

A: “Since you have posted a question with multiple sub-parts, we will solve first three subparts for…

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

A: f ={     AB → C,      A → D,      B → F,  F → GH,  D → IJ   } To find the key check the RHS of the…

Q: Given the following UML. Transform this model to the database schema. Mark the keys & foreign keys.…

A: According to the information given:- We have to transform this given model to database schema.

Q: Assume you apply a functional dependence in the BCNF decomposition technique to deconstruct a…

A: Intro Assume you apply a functional dependence in the BCNF decomposition technique to deconstruct a…

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: 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 the schemas for the table people, and the tables students and teachers, which were created…

A: Given: Consider the schemas for the table people, and the tables students and teachers, which were…

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: 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: Given a relational schema r(A, B, C, D), does A →→ BC logically imply A →→ B and A →→ C? If yes…

A: Solution:   “No”, A→→BC does not imply A→→B and A→→C.

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: Transform the following E-R diagram into relations.

A: For 1:M relationship include primary key of entity whose participation is many into schema of other…

Q: 4. What is the difference between the natural join RS and the theta-join RC S where the condition C…

A:

Q: Given a relation schema R = (A, B, C) and its functional dependencies F = {A →B, B→ C). Suppose R is…

A: Answer is given below-

Q: Suppose you wish to perform keyword querying on a set of tuples in a database, where each tuple has…

A: Term Frequency (TF) in its simplest form is defined as the number of times a term occurs in a…

Q: Consider a many-to-one relationship R between entity sets A and B. Supposethe relation created from…

A: Constraints in SQL: In SQL, Constraints refer to certain rules that are imposed on databases to…

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: Should the cardinality between entities be translated/read from both ends of the notation when…

A: Cardinality: Cardinality refers to the maximum or lowest number of components that may be used on…

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: Compute the closure of the following set F of functional dependencies for relation schema R = (A, B,…

A: Here in this question we have given a relation with some FDs. And we have asked to find out the all…

Q: Q7. Consider a database containing two relations: R(A,B,C) and S(D,E,F). For each of three (your…

A: Answer:-

Q: Find the candidate key(s) for the following relations.

A:

Q: g set of five functional dependencies which hold on R: A → B A C BD → E EC → A E →G ompute the…

A: Closure (CE) = { C, E, G, A, B} Closure (AD) ={A, D, B, C, E, G}

Q: in a database system the functional dependency preservation within relations is critically…

A: If in a database system the functional dependency preservation within relations is critically…

Q: A database of application of wholesaler can be modelled by means of the relations price, in_stock…

A:

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

A:

Q: 1. Consider the relational schema part (part_id, name, cost) subpart (part_id, subpart_id, count) A…

A: Introduction

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: 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 the universal relation R (A, B, C, D, E, F, G} and the set %3! of functional dependencies F…

A: The Relation given is : R = { A, B, C,D ,E, F, G} And the functional dependencies are: B,C --> A…

Q: he database relation R(a, b, d, e, f) ibute b and d are dependent only on a; e y on d; and f only on…

A: The functional dependency possible are  a->b, d d -> e, f Here a is primary key for the given…

Q: Decompose the relations, as necessary, into collections of relations that are in BCNF. R(A,B,C,D)…

A:

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

A: Given: Consider the relation r(A, B, C) with the attribute A as the index. Give an example of a…

Q: Compute the closure of the following set F of functional dependencies for relation schema R = (A, B,…

A: The Functional  Schema R= (A,B,C,D,E) Given functional dependencies : A  →  BC CD → E B → D E  → A…

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: 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 a relation schema R = (X, Y, Z) on which the following functional dependencies hold: { XY →…

A: Here in this question we have given a relation schema R = (X, Y, Z) on which the following…

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: A database of application of wholesaler can be modelled by means of the relations price, in_stock…

A: Algebraic Expresions

Q: B, C, D, E, G, H}, satisfying the functional dependencies F = {E → G, E → H, G → H, A → BC, BC → D,…

A: As per answering guidelines, solving the first 3 question completely.  A)  E → G, E → H, G → H, A →…

Q: Consider the relation schema Appointment={Patient, GP, Date, Time, Clinic, Room} and the following…

A: Locate the Candidate Code: Because the specific date can indeed be retrieved via any other method,…

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: 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: 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: Consider the schema R = (A, B, C, D, E, G, H) and the set F of functional dependencies:AB → CDD →…

A: 3NF decomposition: Any relation is said to be in 3NF if it follows following characteristics: The…

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: the above relation (with proper steps followed). b) Identify which normal form this relation is in

A: Given functional dependencies as, R(ABCDEF)AB->CD, CD->EF, BC->DEF, D->B, CE->F

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…