동일 칼럼을 가지나, 이름을 달리하는 테이블 만들기

CREATE TABLE order_1990 (
    order_id        NUMBER(12),
    order_date      DATE,
    customer_id     NUMBER(6),
    order_total     NUMBER(8, 2),
    sales_rep_id    NUMBER(6)
   );

CREATE TABLE order_1999 AS SELECT * FROM order_1990;
CREATE TABLE order_2000 AS SELECT * FROM order_1990;
CREATE TABLE order_2001 AS SELECT * FROM order_1990;