a) Three relations are given to you, R1(A, B, C), R2(C, D, E), and R3(E, F). The primary keys for R1, R2 and R3 are A, C, and E, respenumber of tuples in R1 is 400, R2 has 700 tuples, and R3 has 1200 tuples. What will be the estimate size of RI R2 MR3,b) What is a query execution plan? Find the inner block and outer block of the following SQL query and write the corresponding extendeexpression for the inner block and outer block as well.SELECT Fname, Lname FROM EMPLOYEE WHERE Salary > ( SELECT MIN (Salary) FROM EMPLOYEE WHERE Dno=6 );c)Discuss how left deep trees and dynamic programming help in cost-based optimization.

a) Consider the given three relations r1, r2, and r3. • In relational algebra joins exhibit the…

Answered: Three relations are given to you, R1(A,…

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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For the table BOOKAUTHOR below you are given the following functional dependencies. BOOKAUTHOR (ISBN, BookTitle, Author_Num, LastName, Publisher, Royalty, Edition) Functional dependencies: 1. ISBN BookTitle, Publisher, Edition 2. Author Num → LastName 3. BookTitle → Publisher 4. {ISBN, Author_Num} → BookTitle, LastName, Publisher, Royalty, Edition Write the types of functional dependencies shown in (1) to (4) above. Also, decompose the table to the third normal from (3NF).
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A rental car company divides its cars into four categories: small, mid-size, full-size, and sport utility. The agency wishes to collect the following information from all vehicles: Vehicle, Make, Model, Year, and Color are all required. There are no distinguishing characteristics for any of the four vehicle classifications. Rents is a connection between the entity type vehicle and the entity type client. There is no one-to-one connection between any of the four vehicle types and any entity type. Would you think about making a supertype/subtype connection for this problem? If so, why or why not?
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7
A relation FarmVisit is defined below with attributes in the table headings. FarmVisit visitorID visitorName date farmID farmName t1 H001 John 1 Feb 2021 A10 Green Field t2 Н005 Ashley 1 Jan 2021 A10 Green Field t3 но05 Ashley 1 Feb 2021 A10 Green Field t4 H005 Ashley 15 Apr 2021 H02 Есо t5 Но06 Ashley 15 Apr 2021 A11 Green Field a) Write down examples of tuples (i.e., tl, t2) to show neither of the following is a functional dependency: (i) visitorID -> date (ii) date -> farmID b) Write down the functional dependency (FDs) using the above data, which can represent all possible data. The FDs should be non-trivial and the determinants of the FDs should contain minimal number of attributes required. c) Using the tuples given, can (visitorID, farmID) be the primary key of FarmVisit? Explain why. d) What the highest normal form by which the FarmVisit relation can be classified? Explain why.

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Three relations are given to you, R1(A, B, C), R2(C, D, E), and R3(E, F). The primary keys for R1 , R2 and R3 are A, C, and E,