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Write SQL update statements to do the following on the schema of the following database. (a) Insert a new student <'Johnson', 25, 1, 'MATH'> in the database. (b) Change the class of student 'Smith' to 2. (c) Insert a new course <'Knowledge Engineering','CS4390', 3,'CS'>. (d) Delete the record for the student whose name is 'Smith' and student number is 17.

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