To sum a union all subquery in Oracle, you can enclose the entire union all subquery within another select statement and use the sum() function on the column that you want to calculate the total sum for. For example: SELECT sum(total_sales) FROM ( SELECT sales_amount as total_sales FROM table1 UNION ALL SELECT sales_amount as total_sales FROM table2 ) subquery;

## How to perform calculations on the results of a union all subquery in oracle?

To perform calculations on the results of a UNION ALL subquery in Oracle, you can wrap the subquery in an outer query where you can then perform the necessary calculations. Here is an example:

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SELECT column1, column2, SUM(column3) AS total_sum FROM ( SELECT column1, column2, column3 FROM table1 UNION ALL SELECT column1, column2, column3 FROM table2 ) subquery GROUP BY column1, column2; |

In this example, we are performing a UNION ALL operation on two tables (table1 and table2) and then calculating the total sum of column3 for each unique combination of column1 and column2.

You can customize the calculations as needed based on your specific requirements and the columns that you have available in your subquery results. Just make sure to wrap the subquery in an outer query and use appropriate aggregation functions (such as SUM, AVG, COUNT, etc.) as needed for your calculations.

## What is the output of a union all subquery in oracle?

The output of a UNION ALL subquery in Oracle will combine the results of two or more SELECT statements into a single result set. This means that all rows from each SELECT statement will be included in the final output, even if there are duplicate rows.

## How to group results in a union all subquery in oracle?

To group results in a UNION ALL subquery in Oracle, you can use a "GROUP BY" clause at the end of the subquery. Here's an example:

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SELECT column1, SUM(column2) FROM ( SELECT column1, column2 FROM table1 WHERE condition1 UNION ALL SELECT column1, column2 FROM table2 WHERE condition2 ) subquery GROUP BY column1; |

In this example, the results from the two SELECT statements in the UNION ALL subquery are grouped by "column1" using the GROUP BY clause. This will aggregate the results by the value in "column1" and apply any aggregate functions (e.g. SUM, COUNT, etc.) to the grouped data.