Database Systems: Design, Implementation, & Management
13th Edition
ISBN: 9781337627900
Author: Carlos Coronel, Steven Morris
Publisher: Cengage Learning
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Chapter 9, Problem 10RQ
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Steps required in the development of an ER diagram:
The below are the eight steps that are required in the development of the ER diagram:
Step 1:
Business rules are identified, analyzed and refined.
Step 2:
Based on the results obtained from the step 1, the main entities can be obtained.
Step 3:
Based on the results obtained from the step 1 and 2, the relationships among the entities are obtained.
Step 4:
The attributes, primary keys and foreign key are defined for each of the entities...
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Given the schema below for the widgetshop, provide a
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Schema name
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Widget-schema
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(stocknum, manufacturer, description, weight,
price, inventory)
(custnum, name, address)
Purchased-schema (custnum, stocknum, pdate)
Requestedby-schema (stocknum, custnum)
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Employee-schema (ssn, name, address, salary)
You can remove the Newitem-schema (red).
True or False: Given the sets F and G with F being an element of G, is it always ture that P(F) is an element of P(G)? (P(F) and P(G) mean power sets). Why?
Can you please simplify (the domain is not empty) ∃xF (x) → ¬∃x(F (x) ∨ ¬G(x)). Fo
Chapter 9 Solutions
Database Systems: Design, Implementation, & Management
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