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多项选择题 Evaluate the following statements:   CREATE TABLE purchase_orders (po_id NUMBER(4),  po_date TIMESTAMP, supplier_id NUMBER(6), po_total NUMBER(8,2),  CONSTRAINT order_pk PRIMARY KEY(po_id)) PARTITION BY RANGE(po_date)  (PARTITION Q1 VALUES LESS THAN (TO_DATE(?1-apr-2007?d-mon-yyyy?), PARTITION Q2 VALUES LESS THAN  (TO_DATE(?1-jul-2007?d-mon-yyyy?),  PARTITION Q3 VALUES LESS THAN(TO_DATE(?1-oct - 2007?d-mon-yyyy?), PARTITION Q4 VALUES LESS THAN (TO_DATE(?1-jan-2008?d-mon-yyyy?));  CREATE TABLE purchase_order_items (po_id NUMBER(4) NOT NULL, product_id NUMBER(6) NOT NULL, unit_price NUMBER(8,2), quantity NUMBER(8), CONSTRAINT po_items_fk FOREIGN KEY  (po_id) REFERENCES purchase_orders(po_id)) PARTITION BY REFERENCE(po_items_fk);   What are the two consequences of the above statements?()

A、 Partitions of PURCHASE_ORDER_ITEMS have system-generated names.

B、 Both PURCHASE_ORDERS and PURCHASE_ORDER_ITEMS tables are created with four partitions each. 

C、 Partitions of the PURCHASE_ORDER_ITEMS table exist in the same tablespaces as the partitions of the PURCHASE_ORDERS table.

D、 The PURCHASE_ORDER_ITEMS table inherits the partitioning key from the parent table by  automatically duplicating the key columns.

E、 Partition maintenance operations performed on the PURCHASE_ORDER_ITEMS table are automatically reflected in the PURCHASE_ORDERS table.

  • B,C
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