DROP TABLE COURSE CASCADE CONSTRAINTS;
DROP TABLE ENROLLMENT CASCADE CONSTRAINTS;
DROP TABLE GRADE CASCADE CONSTRAINTS;
DROP TABLE GRADE_CONVERSION CASCADE CONSTRAINTS;
DROP TABLE GRADE_TYPE CASCADE CONSTRAINTS;
DROP TABLE GRADE_TYPE_WEIGHT CASCADE CONSTRAINTS;
DROP TABLE INSTRUCTOR CASCADE CONSTRAINTS;
DROP TABLE SECTION CASCADE CONSTRAINTS;
DROP TABLE STUDENT CASCADE CONSTRAINTS;
DROP TABLE ZIPCODE CASCADE CONSTRAINTS;

DROP SEQUENCE COURSE_NO_SEQ;
DROP SEQUENCE INSTRUCTOR_ID_SEQ;
DROP SEQUENCE SECTION_ID_SEQ;
DROP SEQUENCE STUDENT_ID_SEQ;