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drop table if exists COURSE_INSTRUCTORJG; drop table if exists CLASSJG; drop table if exists COURSEJG; drop table if exists INSTRUCTORJG; create table INSTRUCTORJG( InstructorID int, DepartHead int, primary key(InstructorID) ); create table COURSEJG( CourseNo char(10), ComputerNeeded smallint, primary key(CourseNo) ); create table CLASSJG( Building CHAR(20), RoomNum smallint, Maxcap int, primary key(Building, RoomNum), KEY(RoomNum) ); create table COURSE_INSTRUCTORJG ( COURSEJG_CourseNo CHAR(10), INSTRUCTORJG_InstructorID INT, Semester CHAR(20), Section INT, CLASSJG_Building char(20), CLASSJG_RoomNum smallint, primary key(COURSEJG_CourseNo, INSTRUCTORJG_InstructorID, Semester, Section), foreign key (COURSEJG_CourseNo) references COURSEJG(CourseNo), foreign key (INSTRUCTORJG_InstructorID) references INSTRUCTORJG(InstructorID), foreign key (CLASSJG_Building) references CLASSJG(Building), foreign key (CLASSJG_RoomNum) references CLASSJG(RoomNum) );