How to create realtional queries of a given relational schema?

advisor(prof,s#)
grades(s#,c#,grade year)
student(s#,sname)
where c# is course code and s# is student code
create queries in relational algebra as follows
Q:list all students taking at least one course that their advisor teaches?
Q:list all those professors who teaches more than one section of the course?
nylahassan
Asked Nov 18, 2013

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