CREATE TABLE purchase_orders (po_idNUMBER(4), po_dateTIMESTAMP, supplier_idNUM8ER(6), po_totalNUMBER(8,2), CONSTRAINT order_pk PRIMARY KEY(po_id)) PARTITION BY RANGE(po_date) (PARTITIONQ1 VALUES LESS THAN (TO_DATE('01-apr-2007','dd-mm-yyyy')), PARTITIONQ2VALUESLESSTHAN(TO_DATE('01-jul-2007','dd-mm-yyyy')), PARTITIONQ3VALUESLESSTHAN (TO~DATE('01-oct-2007','dd-mm-yyyy')), PARTITIONQ4VALUESLESSTHAN(TO_DATE('Ol-jan-2008','dd-mm-yyyy'))); CREATE TABLE purchase_order_items (po_idNUM3ER(4)NOT NULL, product_idNUMBER(6)NOT NULL, unit_price NUMBER(8,2), quantity NUMBER(8), CONSTRAINT po_items_f k FOREIGN KEY(po_id)REFERENCES purchase_orders(po_id)) PARTITION BY REFERENCE(po_items_fk);