144.View the Exhibit and examine the structure of the PRODUCTS table.

144.View the Exhibit and examine the structure of the PRODUCTS table.
You want to display the category with the maximum number of items.
You issue the following query:
SQL>SELECT COUNT(*),prod_category_id
FROM products
GROUP BY prod_category_id
HAVING COUNT(*) = (SELECT MAX(COUNT(*)) FROM products);

What is the outcome?
A.It executes successfully and gives the correct output.
B.It executes successfully but does not give the correct output.
C.It generates an error because the subquery does not have a GROUP BY clause.
D.It generates an error because = is not valid and should be replaced by the IN operator.
答案：C
解析：SELECT MAX(COUNT(*)) FROM products 这个有问题，去掉max，或者去掉count，或者加一个group by语句就正确了
这道题，应该是加group by