My source is EmpID, Salary- (101, 1000)(102, 2000)(103, 3000).
In the Target I want the following EmpID, Salary,
Composite_Salary- (101, 1000, 1000)(102, 2000, 3000)(103,
3000, 6000). Please guide on how to build the mapping.

Answer Posted / siva

In expression add one column and make it output(sal1) and
salary port as input only.
We will make use of a function named cume(salary) to solve
our problem, rather using any complex mapping

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