Model driven Apps

[Anonymous]

Hello

I recently started using CDS and Model-Driven apps.

So I have four columns A, B, C, D 

Column A value = 10

Column B value = 5 

Column C value = A + B = 15 

Colum D value = 5% of Column C

Please how do I evaluate Column C and Column D on a Dataverse Table?

[GarethPrisk]

There are a few options here.

You can use a Business Rule.

https://docs.microsoft.com/en-us/powerapps/maker/common-data-service/data-platform-create-business-r...

This has some basic mathematical capabilities, and can sum fields together.

NOTE:

• This typically runs on the form itself, but you can/should set it to run at Entity scope (which will let it run on all forms, and on the server for updates/imports)
• You may need multiple rules, and need to plan correctly to ensure that the rules execute in the correct order

You can define column C and D as calculated fields, to do this automatically.

https://docs.microsoft.com/en-us/powerapps/maker/common-data-service/define-calculated-fields

NOTE:

• There is a limit of the number of calculated fields you can have
• Calculated fields are read-only, and derived when the field is read (data is not actually stored)
• Cannot trigger workflows/Flows/etc.

You can use Power Automate to update those fields, with the calculations you discussed. This would mean that you are using regular (non-calculated) fields/columns, which a Flow would set.

NOTE:

• Depending on the volume of data, and frequency of changes, then Flow runs may be a problem
• This is asynchronous, meaning you won't see the fields being calculated and would need to refresh the record after the Flow completed