OrderID 1 2 3 4 5 6 7 8 9 10 CustomerID 101 101 102 103 104 105 106 107 108 109 ProductID 201 202 203 204 205 206 207 208 209 210 Quantity 5 2 1 4 3 2 1 2 3 4 OrderDate 2021-01-01 2021-01-02 2021-01-03 2021-01-04 2021-01-05 2021-01-06 2021-01-07 2021-01-08 2021-01-09 2021-01-10

Enhanced Discovering Computers 2017 (Shelly Cashman Series) (MindTap Course List)
1st Edition
ISBN:9781305657458
Author:Misty E. Vermaat, Susan L. Sebok, Steven M. Freund, Mark Frydenberg, Jennifer T. Campbell
Publisher:Misty E. Vermaat, Susan L. Sebok, Steven M. Freund, Mark Frydenberg, Jennifer T. Campbell
Chapter7: Input And Output: Extending Capabilities Of Computers And Mobile Devices
Section: Chapter Questions
Problem 21SG
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Question

I am trying to find out what the super keys, candidate keys, and primary keys are for this practice problem.

OrderID
1
2
3
4
5
6
7
8
00
9
10
CustomerID
101
101
102
103
104
105
106
107
108
109
ProductID
201
202
203
204
205
206
207
208
209
210
Quantity
5
2
1
4
3
2
1
2
3
4
OrderDate
2021-01-01
2021-01-02
2021-01-03
2021-01-04
2021-01-05
2021-01-06
2021-01-07
2021-01-08
2021-01-09
2021-01-10
Transcribed Image Text:OrderID 1 2 3 4 5 6 7 8 00 9 10 CustomerID 101 101 102 103 104 105 106 107 108 109 ProductID 201 202 203 204 205 206 207 208 209 210 Quantity 5 2 1 4 3 2 1 2 3 4 OrderDate 2021-01-01 2021-01-02 2021-01-03 2021-01-04 2021-01-05 2021-01-06 2021-01-07 2021-01-08 2021-01-09 2021-01-10
Expert Solution
Step 1

Introduction

Understanding the different kinds of keys in a database can be a bit confusing. To start, let's define each term:

  • Super Key: A super key is any combination of attributes that uniquely identifies a tuple in a relation. There may be one or more attributes in it.
  • Candidate Key: A candidate key is a subset of the super key attributes that can uniquely identify a tuple. There may be one or more attributes in it.
  • Primary Key: A primary key is one of the candidate keys that is chosen to uniquely identify a tuple in a relation. It must consist of one attribute.
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