【优技教育】Oracle 19c OCP 082题库(Q 18题)- 2024年修正版
考试科目：1Z0-082
考试题量：90
通过分数：60%
考试时间：150min
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原文地址：http://www.cuug.com.cn/ocp/082kaoshitiku/38219540954.html
第18题：
Q 18、
Choose the best answer.
Examine the description of the EMPLOYEES table:
Name Null? Type
-------------------------------------------------------------
EMPLOYEE_ID NOT NULL NUMBER(4)
EMPLOYEE_NAME NOT NULL VARCHAR2 (100)
SALARY NOT NULL NUMBER(6,2) .
DEPARTMENT_ID NOT NULL NUMBER(4)
Which statement will fail?
A) SELECT department_id, COUNT(*)
FROM employees
WHERE department_id <> 90
HAVING COUNT(*) >= 3
GROUP BY department_id;
B) SELECT department_id, COUNT (*)
FROM employees
WHERE department_id <> 90
AND COUNT(*) >= 3
GROUP BY department_id;
C) SELECT department_id, COUNT (*)
FROM employees
WHERE department_id < 90
GROUP BY department_id
HAVING COUNT(*) >= 3;
D) SELECT department_id, COUNT (*)
FROM employees
HAVING department_id < 90
AND COUNT(*) >= 3
GROUP BY department_id;
Answer：B
(解析：D 答案是出人意料可以执行成功，原因是 having 放在了前面，它是 having 语句中的 and 条件，所以允许用到分组函数。)
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