Question 54

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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Question 54
Delivery trucks enter and leave a depot through a controlled gate. At the depot, each truck is loaded with packages, which will then be delivered to one or more customers. As each truck enters and leaves the
depot, the following information is recorded and uploaded to a database.
• The truck's identification number
The truck's weight
• The date and time the truck passes through the gate
• Whether the truck is entering or leaving the depot
Using only the information in the database, which of the following questions CANNOT be answered?
A
On which day in a particular range of dates did the greatest number of trucks enter and leave the depot?
B
What is the average number of customer deliveries made by each truck on a particular day?
What is the change in weight of a particular truck between when it entered and left the depot?
D
Which truck has the shortest average time spent at the depot on a particular day?
Transcribed Image Text:Delivery trucks enter and leave a depot through a controlled gate. At the depot, each truck is loaded with packages, which will then be delivered to one or more customers. As each truck enters and leaves the depot, the following information is recorded and uploaded to a database. • The truck's identification number The truck's weight • The date and time the truck passes through the gate • Whether the truck is entering or leaving the depot Using only the information in the database, which of the following questions CANNOT be answered? A On which day in a particular range of dates did the greatest number of trucks enter and leave the depot? B What is the average number of customer deliveries made by each truck on a particular day? What is the change in weight of a particular truck between when it entered and left the depot? D Which truck has the shortest average time spent at the depot on a particular day?
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