In the MedicalVisit table the primary key is defined as (Date, Doctor, Patient). 1. If the...

In the MedicalVisit table the primary key is defined as (Date, Doctor, Patient).

1. If the primary key were to be changed to (Doctor, Patient), how would it affect the design and information in the database? (eg information structure in the database, normal form etc.)

2. Please Draw an ER diagram based on the above original Relational Model

Expert Solution

PLEASE FIND THE ANSWER(S) and EXPLANATION BELOW.

Primary key is used to UNIQUELY identify the row in a table.
- When we change the primary key from (Date, Doctor, Patient) to (Doctor, Patient), we will no longer able to uniquely identify the rows in the MedicalVisit table.
- So, this will make the table not in any relation form as it even won't satisfy the First Normal Form (1NF).
ER Diagram for the Relational Model

venereology answered 1 year ago

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