Need help with these questions. Completely stuck.
1. Create a database in PostgreSQL named courses. 2. The database will contain three relations with the schema: Likes (student, professor) Enrolls (student, course) Teaches (professor, course) teaches professor course enrolls student course likes student professor Q5 Find all students that enrolled in only courses taught by professors that they like. 06 Find all students that enrolled in some course taught only by professors that they like. Q7 Find all students that enrolled in some course taught by some professor that they don't like. Q8 Find all students that enrolled in some course taught only by professors that they don't like. CREATE TABLE likes ( student varchar(50), professor varchar(50) ); CREATE TABLE enrolls ( student varchar(50), course varchar(50) ); CREATE TABLE teaches ( professor varchar(50), course varchar(50) ); load table insert into likes (student, professor) values ('sl', 'Einstein'); insert into likes (student, professor) values ('sl', 'Feynman'); insert into likes (student, professor) values ('52', 'Einstein'); insert into likes (student, professor) values ('52', 'Feynman'); insert into likes (student, professor) values ('53', 'Einstein'); insert into likes (student, professor) values ('s', 'Einstein'); insert into likes (student, professor) values ('56', 'Feynman'); insert into likes (student, professor) values ('58', 'Feynman'); insert into likes (student, professor) values ('s11', 'p41'); insert into likes (student, professor) values ('511', 'p42'); insert into likes (student, professor) values ('s12', 'p41'); insert into enrolls(student, course) values ('sl', 'c1'); insert into enrolls(student, course) values ('sl', 'c2'); insert into enrolls (student, course) values ('52', 'c2'); insert into enrolls (student, course) values ('sl', 'c3'); insert into enrolls(student, course) values ('54', 'c4'); insert into enrolls (student, course) values ('55', '64'); insert into enrolls (student, course) values ('56', 'c5'); insert into enrolls (student, course) values ('s7', 'c5'); insert into enrolls(student, course) values ('58', 'c5'); insert into enrolls(student, course) values ('59', 'c5'); insert into enrolls(student, course) values ('310', 'c5'); insert into enrolls(student, course) values ('s11', '641'); insert into enrolls(student, course) values ('s11', '642'); insert into enrolls (student, course) values ('812', 'c41'); insert into enrolls (student, course) values ('512', 'c42'); I insert into teaches (professor, course) values ('Einstein', 'c4'); insert into teaches (professor, course) values ('Einstein', 'c5'); insert into teaches (professor, course) values ('Einstein', 'c6'); insert into teaches (professor,course) values ('Feynman', 'c4'); insert into teaches (professor, course) values ('Feynman', 'c5'); insert into teaches (professor, course) values ('Feynman', 'c7'); insert into teaches (professor, course) values ('p41', 'c41'); insert into teaches (professor, course) values ('p42', 'c42')
