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instructor ( ID , name , dept_name , salary ) teaches ( ID , course id , sec id , semester , year ) 3.
instructor(ID, name, dept_name, salary)
teaches(ID, course id, sec id, semester, year)
3. Write an equivalent relational algebra expression for the following using natural join and the above given schemas.
name (sinstructor.ID =teaches.ID (sdept_name =Physics (instructor teaches)))
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