OCP-1Z0-051-V9.02-161题

161. View the exhibit and examine the description for the SALES and CHANNELS tables.

You issued the following SQL statement to insert a row in the SALES table:

INSERT INTO sales VALUES    

(23, 2300, SYSDATE, (SELECT channel_id            

FROM channels            

WHERE channel_desc='Direct Sales'), 12, 1, 500);

Which statement is true regarding the execution of the above statement?

A. The statement will execute and the new row will be inserted in the SALES   table.

B. The statement will fail because subquery cannot be used in the VALUES clause.

C. The statement will fail because the  VALUES clause is not required with subquery.

D. The statement will fail because subquery in the VALUES clause is not enclosed with in single quotation

marks .

Answer: A

答案解析：

参考：http://blog.csdn.net/rlhua/article/details/12885143

可以在values括号中使用子查询

  该语句可以执行成功，前提是子查询的结果是一个值。

 

 这里需要注意的是：图中只有6个字段，但实际在sh用户下sales表中确有7个字段，此题是按照7个字段来的。

sh@TEST1107> desc sales;
 Name                                                  Null?    Type
 ----------------------------------------------------- -------- ------------------------------------
 PROD_ID                                               NOT NULL NUMBER
 CUST_ID                                               NOT NULL NUMBER
 TIME_ID                                               NOT NULL DATE
 CHANNEL_ID                                            NOT NULL NUMBER
 PROMO_ID                                              NOT NULL NUMBER
 QUANTITY_SOLD                                         NOT NULL NUMBER(10,2)
 AMOUNT_SOLD                                           NOT NULL NUMBER(10,2)