PL-900 Practice Question: Describe the business value of Microsoft Power Platform
A healthcare organization uses Power Apps to manage patient intake forms. The app is built on Dataverse and includes a field for medical record number (MRN) that must be unique. The app currently uses a text input, but duplicate MRNs have been entered. What is the best way to enforce uniqueness at the data layer?
⚠ Common exam trap
Test-takers frequently confuse client-side validation (business rules, app validation) with data-layer enforcement, assuming any uniqueness check in the app or a flow is sufficient, but only alternate keys (or unique constraints) guarantee integrity at the database level.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Create a Dataverse alternate key on the MRN field
A Dataverse alternate key enforces uniqueness at the database level, preventing duplicate MRN values from being saved regardless of how data enters the system. This is the only option that operates at the data layer, ensuring integrity even if the app, a flow, or an external integration submits a record. Alternate keys are indexed and validated by Dataverse before commit, making them the proper solution for unique field constraints.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Create a Dataverse alternate key on the MRN field
Why this is correct
Alternate keys enforce uniqueness at the database level, preventing duplicates.
- ✗
Use a Power Automate flow to check for duplicates after submission
Why it's wrong here
This is a reactive approach and may still allow duplicates temporarily.
- ✗
Configure a business rule on the MRN field
Why it's wrong here
Business rules do not enforce uniqueness; they only set field values or show messages.
- ✗
Add a validation rule in the app to check for duplicates before submitting
Why it's wrong here
Validation rules can be bypassed or not triggered if multiple submissions occur simultaneously.
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