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
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.
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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