Suppose you are given a database relation R with single-valued atomic attributes (A, B, C, D, E) and a set of functional dependencies F = {AB-C, AC→B, AE, B→D, BC→AE}(a) List all candidate keys for R. (6 points)(b) Name the strongest normal form that holds on R and explain. (4 points)(c) Decompose it into a collection of BCNF relations if it is not in BCNF. Show all steps. (6 points)For the toolbar, press ALT+F10 (PC) or ALT+FN+F10 (Mac).Open Sans,ari...10ptx² X2میP><[]<> † {;}Ка?لاک(+BIUSParagraph===由用EXE+ ŒP-|||ABCAП"" ΩIx用:0 WORDS POWERED BY TINY

To address the problems posed, let's go through each part step by step. ### (a) List all candidate…

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Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Consider a relation schema R = {A, B, C, D, E} and its functional dependency set F = {A → BC,CD → E,B →D,E → A}. Let R be decomposed into R1 and R2, where R1 = (A,B,C) and R2 = (A,D,E). Is the decompositionlossless? Is the decomposition dependency preserving? (a) The decomposition is lossless and dependency preserving.(b) The decomposition is neither lossless nor dependency preserving.(c) The decomposition is not lossless but dependency preserving.(d) The decomposition is lossless but not dependency preserving.
The divide-and-conquer tactic and dynamic programming vary in significant ways.
Consider a schema R and a set F of functional dependencies as follows: R = (A,B,C,D,E). F = {A → BC,CD → E,B →D,E → A}. Determine whether or not the following decomposition of R is a lossless decomposition: R = (A, B, C), R2 = (A, D, E). Show your computational steps as you derive the answer.
Let W(A, B) and Q(C,D) be two relation schemas. Let r₁ and r2 be the corresponding relation instances. B is a foreign key that refers to C in r2. Assuming that all tuples in r₁ and r2 satisfy referential integrity constraints, which of the following is ALWAYS TRUE? (А) Пв (г1) - Пс (rz) =Ø (B) IIc (₂)-118 (1₁) = 0 (С) Пв (г1 ) = Пс (12) (D) Пв (r1 ) - Пс (12) +Ø OB OD OA O C
Suppose you are given a relation R = (A,B,C,D,E) with the following functional dependencies: {CE -> D,D -> B,C -> A}. Identify the best normal form that R satisfies (1NF, 2NF, 3NF). Explain Why
Consider the relation R = {A, B, C, D, E, F, G, H, I,J} and the set of functional dependencies F = { {A, B} → {C}, {A} → {D, E}, {B} → {F}, {F} →{G, H}, {D} → {I, J} }. (b) Whether (A,B,F} is a super key? Whether {A,B,F} is a candidate key? Why? (c) Whether {A,D} is a super key? Whether {A,D} is a candidate key? Why?
Consider a database that belongs to an airline and employs snapshot isolation for its database management system. Describe an instance in which a nonserializable execution takes place, but the airline is open to the possibility that it will be prepared to tolerate it in exchange for improved overall performance.
Consider a database table that includes a salary attribute. Suppose the three queries avg, count, and max (in that order) are made on the salary attribute, all conditioned on the same predicate involving other attributes. That is, a specific subset of records is selected and the three queries are performed on that subset. Suppose that the first two queries are answered and the third query is denied. Is any information leaked?
Consider the relation prereg in the University Database and its transitive closure defined in Section 5.4 of the textbook. Consider the recursive query in Figure 5.16 that outputs this transitive closure. Write a recursive query that finds all direct or indirect prerequisite of BIO-301. Output a table with one column that contains the IDs of all such prerequisites. Note that your query must work correctly not only for the given instance of prereg, but also for all possible instances. Run this query.
Consider a database that includes the entity sets student, course, and sectionfrom the university schema and that additionally records the marks that studentsreceive in different exams of different sections.a. Construct an E-R diagram that models exams as entities and uses a ternaryrelationship as part of the design.b. Construct an alternative E-R diagram that uses only a binary relationshipbetween student and section. Make sure that only one relationship existsbetween a particular student and section pair, yet you can represent themarks that a student gets in different exams.
Design a relational database schema from the Car Sharing IS domain class diagram. Output should look like image number 2
Subject: Database Management System Please solve this question

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