1z0-071 Exam Dumps | Examine the description of the EMPLOYEES table (Exhibit) You write this failing statement: SELECT dept

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Question 112/139

Examine the description of the EMPLOYEES table

You write this failing statement:
SELECT dept_no AS department_id, MAX (salary) As max_sal
FROM employees
WHERE salary >10000
GROUP BY department_id
ORDER BY max_sal;
Which clause causes the error?

A. ORDER BY

B. WHERE

C. GROUP BY

D. SELECT

Correct Answer: C

In the SQL statement provided, the error is caused by the GROUP BY clause. In Oracle SQL, when using GROUP BY, the expression in the GROUP BY clause must match exactly the expression in the SELECT list. The GROUP BY clause should reference the column name dept_no as mentioned in the SELECT list, not the alias department_id which is defined within the same SELECT statement.
The corrected SQL statement should be:
SELECT dept_no AS department_id, MAX(salary) As max_sal FROM employees WHERE salary > 10000 GROUP BY dept_no -- Changed from 'department_id' to 'dept_no' ORDER BY max_sal; References:
* Oracle Documentation on GROUP BY clause: GROUP BY Clause

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