OCP 11g考试题库详解：1Z0-051-113题

OCP 11g考试题库详解：1Z0-051-113题，完整题库请点击这里联系老师咨询了解

113. Examine the structure of the ORDERS table:

Name Null Type

ORDER_ID NOT NULL NUMBER(12)

ORDER_DATE NOT NULL TIMESTAMP(6)

CUSTOMER_ID NOT NULL NUMBER(6)

ORDER_STATUS NUMBER(2)

ORDER_TOTAL NUMBER(8,2)

You want to find the total value of all the orders for each year and issue the following command:

SQL>SELECT TO_CHAR(order_date,'rr'), SUM(order_total)

FROM orders

GROUP BY TO_CHAR(order_date,'yyyy');

Which statement is true regarding the outcome?

A. It executes successfully and gives the correct output.

B. It gives an error because the TO_CHAR function is not valid.

C. It executes successfully but does not give the correct output.

D. It gives an error because the data type conversion in the SELECT list does not match the data type conversion in the GROUP BY clause. 格式不一致

Answer: D

试题解析：

报错，因为SELECT列表中的数据类型转换与GROUP BY子句中的数据类型转换不匹配。

rr和yyyy的格式不一致，改为一致后可以得出数据。