OCP 11g考试题库详解：1Z0-051-114题
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114. View the Exhibit and examine the structure of the SALES table.
The following query is written to retrieve all those product ID s from the SALES table that have more than
55000 sold and have been ordered more than 10 times.
SQL> SELECT prod_id
FROM sales
WHERE quantity_sold > 55000 AND COUNT(*)>10
GROUP BY prod_id
HAVING COUNT(*)>10;
Which statement is true regarding this SQL statement?
A. It executes successfully and generates the required result.
B. It produces an error because COUNT(*) should be specified in the SELECT clause also.
C. It produces an error because COUNT(*) should be only in the HAVING clause and not in the WHERE clause.
D. It executes successfully but produces no result because COUNT(prod_id) should be used instead of COUNT(*).
Answer: C
试题解析：
因为COUNT(*)只能用在HAVING子句中，不能在WHERE子句中
where子句不能带组函数
