Sum Columns in Related Child Tables

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Posted on by BenDonahue

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I have a master table the records events (Events). There is a child table that records %Complete for each task on a 1-M basis (Tasks).

Each Event defines a dataset in the child table containing all the Tasks associated with that Event.

I want to get a sum of all %Complete from the Child table for each Event.

This works:

Sum(First(Events).Tasks, %Complete)

This does not work:

Clear(TotalPctComplete);

ClearCollect(Events, Columna = "this"); 
// I added the above to demonstrate that simply taking a Sum against the whole Task set on PercentComplete will not satisfy my requirements)

ForAll(colEvents As _Table,
 Collect(TotalPctComplete,
 {
 TotalPercent: Sum(_Table.Tasks, PercentComplete)
 }
);

Any assistance is greatly appreciated, so, thank you very much, 😁!!!

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KeithAtherton 3,709 Most Valuable Professional on at

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Hi @BenDonahue,

Bit of a leftfield suggestion here but have you considered creating a rollup column on the parent Event table?:

https://learn.microsoft.com/en-us/training/modules/create-define-calculation-rollup-fields/1-intro

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