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Week 2: Discussion 
After you review Chapter 2 in your textbook and review all course materials in Module 2, please answer the following two questions:
After reading chapter 2 of the book and going through the slides of week 2, answer the following questions:
1A)- What is a relational Model?
1B) – Define entity, attribute, relationship, and constraints in an ERD (Entity Relationship Diagram).
2- What is a Primary Key?
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You are required to make at least two comments on the responses posted by you classmates with a minimum of 50 words. 

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