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How to add results of 2 $amt Oracle subquery fields

How to add results of 2 $amt Oracle subquery fields

How to add results of 2 $amt Oracle subquery fields


How can you add the results of two $amount Oracle subquery fields together using their AS subquery column names

I get invalid column name errors when I try to reuse and add them together using the subquery results AS column names lower down in the main SQL script, although they display OK coming out of the subqueries.

RE: How to add results of 2 $amt Oracle subquery fields

You can not use a column correlation name in other expressions, except in the order by clause.

The general technique is


select a + b
   from (select <expression> as a, <expression> as b, ...
            from ...) dt

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