In Oracle SQL, set operations like UNION, UNION ALL, INTERSECT, and MINUS can be used to combine results from different queries:
Option A:
Combining results using UNION ALL followed by ORDER BY will execute successfully because UNION ALL allows duplicate rows and ORDER BY can be used to sort the combined result set.
Option E:
Similar to option A, UNION ALL combines all rows from the two selects and allows ordering of the results.
Option G:
UNION combines the results from two queries and removes duplicates, and ORDER BY can be used to sort the final result set.
Options B, C, D, and F are incorrect because:
Option B: You cannot intersect different columns (ORDER_ID with INVOICE_ID).
Option C: Incorrect column names and syntax with ORDER BY.
Option D: ORDER BY cannot be used before a set operator like INTERSECT.
Option F: ORDER BY cannot be used directly after a MINUS operator without wrapping the MINUS operation in a subquery.