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)
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)