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Write the following queries in Relational Algebra Find the first and last names for all agents having clearance level more than 5. Find the unique

Write the following queries in Relational Algebra

Find the first and last names for all agents having clearance level more than 5.

Find the unique agent id, first, and last names for agents who have Secret clearance and have a salary greater than $65,000.

Find the unique agent names of all agents in Spain and with the Communications skill.

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