How to merge results of an union all in oracle?

@denis 

To merge the results of a UNION ALL operation in Oracle, you can use a common table expression (CTE) or a subquery to combine the results. Here is an example of how you can achieve this:

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WITH merged_results AS (
    SELECT column1, column2
    FROM table1
    UNION ALL
    SELECT column1, column2
    FROM table2
)
SELECT *
FROM merged_results;

In this example, we first create a CTE called "merged_results" that combines the results of two SELECT statements using UNION ALL. Then, we query the data from the CTE to display the merged results.

Alternatively, you can use a subquery to achieve the same result:

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SELECT *
FROM (
    SELECT column1, column2
    FROM table1
    UNION ALL
    SELECT column1, column2
    FROM table2
) merged_results;

Both approaches will merge the results of the UNION ALL operation and display the combined data from the two tables.