1z0-071 Exam Dumps | Examine this query which executes successfully; Select job,deptno from emp Union all Select job,deptno

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Question 100/139

Examine this query which executes successfully;
Select job,deptno from emp
Union all
Select job,deptno from jobs_history;
What will be the result?

A. It will return rows from both select statements after eliminating duplicate rows.

B. It will return rows common to both select statements.

C. It will return rows both select statements including duplicate rows.

D. It will return rows that are not common to both select statements.

Correct Answer: C

For the provided UNION ALL query:
* Option C: It will return rows from both SELECT statements including duplicate rows.
* UNION ALL is used to combine the results of two SELECT statements and does not eliminate duplicates.
Options A, B, and D are incorrect because:
* Option A: UNION ALL does not eliminate duplicate rows, unlike UNION.
* Option B: This would be true for INTERSECT, not UNION ALL.
* Option D: This would be true for EXCEPT or MINUS, not UNION ALL.

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