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【第60题】OCP认证1Z0-071最新考试题库及答案

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071考试不仅是OCP11g的考试科目，同时也是OCP 12c的考试科目，所以关心071考题的同学有很多，对此我们专门收集整理了近期071考试的原题，并对这些考题进行讲解，希望帮助广大考生顺利通过071考试。

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071考题解析-第60题、choose the best answer:

Evaluate the following SQL commands:

SQL>CREATE SEQUENCE ord_seq

INCREMENT BY 10

START WITH 120

MAXVALUE 9999

NOCYCLE;

SQL>CREATE TABLE ord_items

(ord_no NUMBER(4) DEFAULT ord_seq.NEXTVAL NOT NULL,

item_no NUMBER(3),

qty RIUNBER(3) CHECK (qty BETWEEN 100 AND 200),

expiry_date date CHECK (expiry_date > SYSDATE),

CONSTRAINT it_pk PRIMARY REY (ord_no,item_no),

CONSTRAINT ord_fk FOREIGN KEY(ord_no) REFERENCES orders(ord_no));

The command to create a table fails. Identify the reason for the SQL statement failure.

A) You cannot use SYSDATE in the condition of a CHECK constraint.

B) You cannot use the NEXTVAL sequence value as a DEFAULT value for a column.

C) You cannot use the BETWEEN clause in the condition of a CHECK constraint.

D) You cannot use ORD_NO and ITEM_NO columns as a composite primary key because ORD_NO is also the FOREIGN KEY.

Answer：A

(check 约束中明确要求不能：

参考 CURRVAL, NEXTVAL, LEVEL, 和 ROWNUM 这样的伪列

调用 SYSDATE, UID, USER,和 USERENV 函数

参考其它列值的查询

)

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