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Use related records in calculated column to calculate average score.

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Posted on by Usman2

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In my canvas app I have two Dataverse tables Student and Test, one student can attempt many tests so the relationship is one-to-many.

In Test table I have the score column (Decimal number) which contains the score for the test that the student has attempted. Now in the Student table I want to create a calculated column which will contain the average score of the attempted tests by the student.

Example

Student A attempts 2 tests

Test 1 - Score 80

Test 2 - Score 90

Student A average score 85

Note: Average score must be saved in database.

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Microsoft Dataverse with Power Apps

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Drew Poggemann 9,287 Most Valuable Professional on at

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Hi @Usman2 ,

You can utilize Rollup fields for this purpose as rollup fields can do Avg as one of the calculations... (I know this references on premises but the details are the same):

https://docs.microsoft.com/en-us/dynamics365/customerengagement/on-premises/customize/define-rollup-fields?view=op-9-1

Here is a video showing details on rollup columns: https://youtu.be/ntk57m4A9ko

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Usman2 124 on at

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@dpoggemann
Thanks for the solution but now I have one more problem as I thought about it I think that the relationship between Student and Test will be N-to-N will this roll up columns still work. Because in the video the guy says it will not work for N-to-N relation.

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Drew Poggemann 9,287 Most Valuable Professional on at

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Hi @Usman2 ,

No, this will not work with N:N relationships. My recommendation is to create an intersect entity like the following:

Student --> Student Test <-- Test

1:N from Student to Student Test

1:N from Test to Student Test

This way you can store metadata on the Student Test entity (including score) and you will be able to do the rollup on the Student to the Test scores or on the Test to the Student Tests...

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