【12c OCP认证】2019年度OCP最新考试题库-071.87题

文章来源：更新时间:2019/3/21 13:16:16

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87、View the exhibit and examine the structure of the SALES, CUSTOMERS, PRODUCTS and TIMES

tables.

The PROD_ID column is the foreign key in the SALES tables, which references the PRODUCTS table.

Similarly, the CUST_ID and TIME_ID columns are also foreign keys in the SALES table referencing the CUSTOMERS and TIMES tables, respectively.

Evaluate the following CREATE TABLE command:

CREATE TABLE new_sales (prod_id, cust_id, order_date DEFAULT SYSDATE) AS SELECT prod_id, cust_id, time_id FROM sales;

Which statement is true regarding the above command?

A. The NEW_SALES table would get created and all the NOT NULL constraints defined on the specified columns would be passed to the new table.

B. The NEW_SALES table would not get created because the DEFAULTvalue cannot be specified in the column definition.

C. The NEW_SALES table would not get created because the column names in the CREATE TABLEcommand and the SELECTclause do not match.

D. The NEW_SALES table would get created and all the FOREIGN KEYconstraints defined on the specified columns would be passed to the new table.

Correct Answer: A

Section: (none)

Explanation( ( 解析：经过测试发现表能够创建成功，非空约束被传递到新表，以前没有注意这一点，其它约束不会传递，defualt 选项只会影响以后插入的行，对当前的行没有任何影响;如果在 order_date 列上加一个非空约束，则会报错，因为当前表的行可能有空值。)