1z0-071 Exam Dumps | Examine the data in the EMP table: (Exhibit) You execute this query: SELECT deptno AS "Department", AVG(sal)

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Question 69/144

Examine the data in the EMP table:

You execute this query:
SELECT deptno AS "Department", AVG(sal) AS AverageSalary, MAX(sal) AS "Max Salary" FROM emp WHERE sal >= 12000 GROUP BY "Department " ORDER BY AverageSalary; Why does an error occur?

A. An alias name must not be used in an ORDER BY clause.

B. An allas name must not contain space characters.

C. An alias name must not be used in a GROUP BY clause.

D. An alias name must always be specified in quotes.

Correct Answer: C

C . True. The error occurs because the alias "Department" used in the GROUP BY clause is enclosed in double quotes, which makes it case-sensitive. However, the column deptno is not originally created with double quotes in the table definition, so you cannot refer to it with a case-sensitive alias in the GROUP BY clause. Oracle interprets "Department" as a string literal, not a column alias, in the GROUP BY clause.
A is incorrect because you can use an alias in an ORDER BY clause. B is incorrect because an alias can contain space characters if it is quoted. D is incorrect because an alias does not always have to be specified in quotes, only when it includes special characters or spaces or if it is case-sensitive.

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