Following is the database schema:

 

Following is the query 1 and query 2:

Q1. Write query 1 and query 2 in relational calculus using universal quantification.

Q2. Write query 1 and query 2 in relational calculus using only essential quantification.

Q3. Write query 1 and query 2 in SQL query that uses only NOT EXISTS on nested queries.
 
 

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