Sid Sname Rating Age Sid Bid Day 22 Dustin 7 45.0 22 101 10/10/98 29 Brutus 1 33.0 22 102 10/10/98 31 Lubber 8 55.5 22 103 10/8/98 Bid Bname Color 32 Andy 25.5 22 104 10/7/98 101 Interlake Blue 58 Rusty 10 35.0 31 102 11/10/98 102 Interlake Red 103 Clipper 104 Marine Red 64 Horatio 7 35.0 31 103 11/6/98 Green 71 Zorba 10 16.0 31 104 11/12/98 74 Horatio 9 35.0 64 101 9/5/98 An Instance B1 of Boats 85 Art 25.5 64 102 9/8/98 95 Bob 3 63.5 74 103 9/8/98 nctanco E ilore An Instance 82 of Besenves

Sid Sname Rating Age Sid Bid Day 22 Dustin 7 45.0 22 101 10/10/98 29 Brutus 1 33.0 22 102 10/10/98 31 Lubber 8 55.5 22 103 10/8/98 Bid Bname Color 32 Andy 25.5 22 104 10/7/98 101 Interlake Blue 58 Rusty 10 35.0 31 102 11/10/98 102 Interlake Red 103 Clipper 104 Marine Red 64 Horatio 7 35.0 31 103 11/6/98 Green 71 Zorba 10 16.0 31 104 11/12/98 74 Horatio 9 35.0 64 101 9/5/98 An Instance B1 of Boats 85 Art 25.5 64 102 9/8/98 95 Bob 3 63.5 74 103 9/8/98 nctanco E ilore An Instance 82 of Besenves

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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Concept explainers

Types Of Protocols

A network protocol is a collection of rules that governs the exchange of data between devices connected to the same network. In other words, network protocols are rules that specify how devices communicate or transfer data over a network. The sender and receiver systems must obey the standards to facilitate communication between them.

Question

Use the relational algebra to find name of sailors who have reserved boat #103

Sid
Sname Rating
Age
Sid
Bid
Day
22
Dustin 7
45.0
22
101
10/10/98
29
Brutus
1
33.0
22
102
10/10/98
31
Lubber 8
55.5
22
103
10/8/98
Bid
Bname Color
32
Andy
8
25.5
22
104
10/7/98
101 Interlake Blue
58
Rusty
10
35.0
31
102
11/10/98
102 Interlake Red
64
Horatio 7
35.0
31
103
11/6/98
103 Clipper
Green
71
Zorba
10
16.0
31
104
11/12/98
104 Marine
Red
74
Horatio 9
35.0
64
101
9/5/98
An Instance B1 of Boats
85
Art
3
25.5
64
102
9/8/98
95
Bob
3
63.5
74
103
9/8/98
An Instance S3 of Sailors
An Instance R2 of Reserves

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