Write a relational algebra statement that produces a relation with the columns:

student.name

student.dept$\_$name

student.tot$\_$cred

instructor.name $($the instructor that advises the student$)$

instructor.dept$\_$name

Only keep students who have earned more than $90$ credits.

Note:

You will have to use the student, instructor, and advisor relations.

You should only include students that have an advisor, i$.$e$.,$ instructor.name and instructor.dept$\_$name should be non$-$null for all rows.