【第15题】【063题库】2019年OCP12c认证1Z0-063考试题库大全
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我要咨询OCP 12c考试考3科，分别是071、062、063，之前071和062都已经做过解析，这里开始063题库解析，希望对考063的同学有帮助，顺利通过063考试。
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15题、Evaluate these 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('01-apr-2007','dd-mon-yyyy')),
PARTITION Q2 VALUES LESS THAN (TO_DATE('01-jul-2007','dd-mon-yyyy')),
PARTITION Q3 VALUES LESS THAN (TO_DATE('01-oct-2007','dd-mon-yyyy')),
PARTITION Q4 VALUES LESS THAN (TO_DATE('01-jan-2008','dd-mon-yyyy' )));
CREATE TABLE purchase_order_items
(po_id NUMBER(4)NOT NULL,
product_id NUMBER(6) NOT NULL,
unit_prlce 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); .
Which two statements are true?
A. Partitions of purchase_order_items are assigned unique names based on a sequence.
B. The purchase_orders and purchase_order_items tables are created with four partition each.
C. purchase_order_items table partitions exist in the same tablespaces as the purchase_orders table partitions.
D. The purckase_order_items table inherits the partitioning key by duplicating the key columns from the parent table.
E. Partition maintenance operations on the purchase_order_items table require disabling the foreign key constraint.
Answer: B BC
(由于是引用分区，所以子表无法对分区进行维护，只有在父表添加和删除分区时，子表也会自动的添加和删除分区，所以对于引用分区表，不能单独对子表的分区进行操作)
