1z0-071 Exam Dumps | Examine the description of the EMPLOYEES table: (Exhibit) Which statement will fail?

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Question 126/139

Examine the description of the EMPLOYEES table:

Which statement will fail?

A. SELECT department_id, COUNT (*)
FROM employees
HAVING department_ id <> 90 AND 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 HAVING COUNT(*) >= 3
GROUP BY department_id;

D. SELECT department_id, COUNT(*)
FROM employees
WHERE department_id <> 90 GROUP BY department_id
HAVING COUNT(*) >= 3;

Correct Answer: B

The statement that will fail is B. In Oracle SQL, the WHERE clause cannot contain aggregate functions directly. The HAVING clause is used instead to apply conditions that involve aggregates, but it is applied after the GROUP BY clause.
A). While the HAVING clause is used before the GROUP BY clause which is not standard SQL syntax, Oracle SQL may still execute it successfully due to its flexibility in syntax.
B). This statement will fail because it uses an aggregate function, COUNT(*), in the WHERE clause, which is not allowed. The correct approach is to use the HAVING clause to filter the results of aggregate functions after the GROUP BY clause.
C). This statement is correct; it places the HAVING clause after the GROUP BY clause, applying the filter on the aggregated count.
D). This is a correctly constructed statement with the WHERE clause filtering individual records before grouping, and the HAVING clause filtering groups based on the aggregate function.
References:
* Oracle Database SQL Language Reference, 12c Release 1 (12.1): "WHERE Clause"
* Oracle Database SQL Language Reference, 12c Release 1 (12.1): "HAVING Clause"

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