onsider the following schema of a car renting agency Vehicle(Vno, Vmake, Vtype, Vprice) Driver(Dno. License Year, Experience, State) Drives(Dno, Vno, Date, Start time, End Time) There are two proposals to define primary keys for Vehicle (a) Vno, Vmake and (b) Vno. Which one would you choose and why? Write SQL queries to do the following a. i. Find all vehicles whose price is greater than 2 lakhs and order these by their make in ascending order ii. Find the experience of those drivers who drove vehicle number DL 2C 4745.
onsider the following schema of a car renting agency Vehicle(Vno, Vmake, Vtype, Vprice) Driver(Dno. License Year, Experience, State) Drives(Dno, Vno, Date, Start time, End Time) There are two proposals to define primary keys for Vehicle (a) Vno, Vmake and (b) Vno. Which one would you choose and why? Write SQL queries to do the following a. i. Find all vehicles whose price is greater than 2 lakhs and order these by their make in ascending order ii. Find the experience of those drivers who drove vehicle number DL 2C 4745.
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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Transcribed Image Text:Q3
Consider the following schema of a car renting agency
(7.5+7.5= 15)
Vehicle(Vno, Vmake, Vtype, Vprice)
Driver(Dno. License Year, Experience, State)
Drives(Dno, Vno, Date, Start time, End Time)
There are two proposals to define primary keys for Vehicle (a) Vno, Vmake and (b) Vno. Which one
would you choose and why?
a.
Write SQL queries to do the following
i. Find all vehicles whose price is greater than 2 lakhs and order these by
their make in ascending order
ii. Find the experience of those drivers who drove vehicle number DL 2C
4745.
b. For each of the queries above
i. Build the query tree and clearly identify the heuristics used
ii. What is the order of execution of operations of each
query
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