Question
Language: SQL / Database Management Question: Choose a primary key for the items table, fully explaining and justifying your answer, including why any other potential
Language: SQL / Database Management
Question: Choose a primary key for the items table, fully explaining and justifying your answer, including why any other potential candidate keys are not suitable.
The following four data tables describe the available items, orders, users, and deliveries for a certain restaurants online delivery service:
items
| code | description | price |
|---|---|---|
| HAMBGR | Hamburger | 4.29 |
| CHZBGR | Cheeseburger | 4.99 |
| FRYSML | Small fries | 1.99 |
| FRYLRG | Large fries | 2.99 |
| FNCOLA | Coke | 1.49 |
orders
| order_id | item | quantity |
|---|---|---|
| 0001 | CHZBGR | 2 |
| 0001 | FRYLRG | 1 |
| 0002 | HAMBGR | 1 |
| 0002 | FNCOLA | 1 |
| 0003 | CHZBGR | 3 |
users
| login | name | address |
|---|---|---|
| john123@geemail.com | John | 123 Number St |
| alice89@h0tmail.edu | Alice | 88 Infinity Rd |
| jdepp@pirates.com | Johnny | 21 Jump St |
| kat22@yah000.net | Kathryn | 65 Leonin Ln |
deliveries
| order_id | user | delivered |
|---|---|---|
| 0001 | alice89@h0tmail.edu | Yes |
| 0002 | john123@geemail.com | Yes |
| 0003 | alice89@h0tmail.edu | No |
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Joe Celkos Data And Databases Concepts In Practice
Authors: Joe Celko
1st Edition
1558604324, 978-1558604322
