consider the following gradebook relational schema describing th

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consider the following gradebook relational schema describing the data for a grade book of a particular instructor. (note: the attributes a, b, c, and d of courses store grade cutoffs.)catalog(cno, ctitle)students(sid, fname, lname, minit)courses(term, sec_no, cno, a, b, c, d)enrolls(sid, term, sec_no)specify and execute the following queries using the ra interpreter on the gradebook database schema.a. retrieve the names of students enrolled in the automata class during the fall 2009 term.b. retrieve the sid values of students who have enrolled in csc226 and csc227.c. retrieve the sid values of students who have enrolled in csc226 or csc227.d. retrieve the names of students who have not enrolled in any class.e. retrieve the names of students who have enrolled in all courses in the catalog table.
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