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Give an expression in the relational algebra to express each of the following queries. Use S, P, R for Selection, Project, and Rename. employee (person_name,

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Give an expression in the relational algebra to express each of the following queries. Use S, P, R for Selection, Project, and Rename. employee (person_name, street, city) works (person_name, company_name, salary) company (company_name, city)

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