The answer is to create a Dataverse alternate key on the MRN field. This is correct because an alternate key enforces uniqueness at the data layer, meaning Dataverse validates and rejects duplicate values before any record is committed, whether entered through a Power App, a flow, or an external integration. On the Microsoft Power Platform Fundamentals PL-900 exam, this concept tests your understanding of data integrity mechanisms versus client-side validation—a common trap is choosing a formula or validation rule that only works within the app. Remember, alternate keys are indexed constraints that guarantee uniqueness across all data entry points, making them the only database-level solution. Memory tip: think of an alternate key as a “database bouncer” that checks IDs at the door, not just at the front desk.
PL-900 Practice Question: Describe the business value of Microsoft Power Platform
This PL-900 practice question tests your understanding of describe the business value of microsoft power platform. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
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?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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
Option A is correct because 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.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
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.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates 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.
Trap categories for this question
Command / output trap
Business rules do not enforce uniqueness; they only set field values or show messages.
Detailed technical explanation
How to think about this question
Under the hood, a Dataverse alternate key creates a unique index on the specified column(s) in the underlying Azure SQL Database, which enforces uniqueness at the storage engine level. This means any attempt to insert a duplicate MRN will throw a SqlException (violation of unique constraint) and roll back the transaction, regardless of the client or service used. In real-world scenarios, this is critical for healthcare systems where MRNs must be globally unique across multiple apps, integrations, and bulk data loads—client-side checks alone cannot prevent race conditions or bypasses.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Describe the business value of Microsoft Power Platform — This question tests Describe the business value of Microsoft Power Platform — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Create a Dataverse alternate key on the MRN field — Option A is correct because 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.
What should I do if I get this PL-900 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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