Examine this query which executes successfully: SELECT job, deptno FROM emp UNION ALL SELECT job, deptno FROM jobs_ history; What will be the result?

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.