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 44/139

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 common to both SELECT statements.

B. It will return rows from both SELECT statements after eliminating duplicate rows.

C. It will return rows that are not common to both SELECT statements.

D. It will return rows from both SELECT statements including duplicate rows.

Correct Answer: D

The UNION ALL operator in SQL is used to combine the results of two or more SELECT statements:
* Option D: It will return rows from both SELECT statements including duplicate rows.
* UNION ALL does not eliminate duplicates; it simply combines all rows from the queries provided.
Options A, B, and C are incorrect as they describe behaviors of other set operators:
* Option A: Describes the behavior of INTERSECT, not UNION ALL.
* Option B: Describes the behavior of UNION, not UNION ALL.
* Option C: Describes the behavior of EXCEPT or MINUS, not UNION ALL.

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