On-the-line is a company which provides software allowing devices to connect to each other in a peer-to-peer network. They maintain a database of network connections created by their software. A simplified version of their database schema has been provided below including foreign key constraints. Relational Schema Device [mac, state, brand, model, serialNumber] DeviceUser [mac. user] Connects [host, client, timestamp, duration] Foreign Keys DeviceUser.mac references Device.mac Connects.host references Device.mac Connects.client references Device.mac
On-the-line is a company which provides software allowing devices to connect to each other in a peer-to-peer network. They maintain a database of network connections created by their software. A simplified version of their database schema has been provided below including foreign key constraints. Relational Schema Device [mac, state, brand, model, serialNumber] DeviceUser [mac. user] Connects [host, client, timestamp, duration] Foreign Keys DeviceUser.mac references Device.mac Connects.host references Device.mac Connects.client references Device.mac
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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![On-the-line is a company which provides software allowing devices to connect to each other in a peer-to-peer
network. They maintain a database of network connections created by their software. A simplified version of
their database schema has been provided below including foreign key constraints.
Relational Schema
Device [mac, state, brand, model, serialNumber]
DeviceUser [mac., user]
Connects [host, client, timestamp, duration]
Foreign Keys
DeviceUser.mac references Device.mac
Connects.host references Device.mac
Connects.client references Device.mac](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F40bdc33b-06ca-45c1-b5e8-c8760a4abf52%2F69d1a0e1-37f9-49b9-8e50-c5b721db3dcb%2Fy8rlf96_processed.png&w=3840&q=75)
Transcribed Image Text:On-the-line is a company which provides software allowing devices to connect to each other in a peer-to-peer
network. They maintain a database of network connections created by their software. A simplified version of
their database schema has been provided below including foreign key constraints.
Relational Schema
Device [mac, state, brand, model, serialNumber]
DeviceUser [mac., user]
Connects [host, client, timestamp, duration]
Foreign Keys
DeviceUser.mac references Device.mac
Connects.host references Device.mac
Connects.client references Device.mac
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