drop table  test97_poly_ordr;
drop table  test97_poly_detail;
drop table  test97_poly_owner;
drop table  test97_poly_prod;
drop table  test97_poly_computer;
drop table  test97_poly_laptop;
drop table  test97_poly_server;
drop table  test97_poly_car;
drop table  test97_poly_truck;
drop table  test97_poly_prod_multi;
drop table  test97_poly_computer_multi;
drop table  test97_poly_laptop_multi;
drop table  test97_poly_server_multi;
drop table  test97_poly_order_product;
drop table  test97_poly_table_m;
drop table  test97_poly_table_n;
drop table  test97_poly_m_n;
