The correct answer is to use the USERELATIONSHIP function in DAX for inactive relationships. This function temporarily activates a specified inactive relationship within a measure, allowing you to filter a dimension table by multiple fact tables without altering the model’s default active relationship. On the Microsoft Power BI Data Analyst PL-300 exam, this scenario tests your understanding of complex data modeling and DAX context transition, often appearing as a drag-and-drop or multiple-choice item where you must choose between CALCULATE, FILTER, or USERELATIONSHIP. A common trap is assuming you can simply use the inactive relationship in a visual without a measure, but Power BI requires explicit DAX to override the default. Remember the mnemonic: “U-R-Ship” stands for Use Relationship Ship—you pilot the inactive link only inside a measure with USERELATIONSHIP.
PL-300 Prepare the data Practice Question
This PL-300 practice question tests your understanding of prepare the data. 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.
You are building a Power BI data model with multiple fact tables and dimension tables. One of the dimension tables has a one-to-many relationship with two fact tables, but the relationships are inactive. You need to create measures that use both fact tables and the dimension table without relying on user interactions to activate relationships. What should you do?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use the USERELATIONSHIP function in the measure definition.
Option C is correct because the USERELATIONSHIP function in DAX allows you to temporarily activate an inactive relationship within a measure definition. This enables you to use a dimension table with multiple fact tables without changing the model's default active relationships or relying on user interactions. By specifying the inactive relationship in the measure, you can perform accurate aggregations across both fact tables while maintaining the intended data model structure.
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.
✗
Merge the fact tables into one table.
Why it's wrong here
Merging changes the granularity and is not best practice.
✗
Create calculated columns in the dimension table to relate to each fact table.
Why it's wrong here
Calculated columns cannot enforce relationships.
✓
Use the USERELATIONSHIP function in the measure definition.
Why this is correct
USERELATIONSHIP activates a specific inactive relationship for a calculation.
Related concept
Read the scenario before looking for a memorised answer.
✗
Change both relationships to active.
Why it's wrong here
Only one active relationship per pair of tables.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often think they must make all relationships active or merge tables to use a dimension with multiple fact tables, not realizing that USERELATIONSHIP provides a clean, dynamic solution without compromising model integrity.
Detailed technical explanation
How to think about this question
Under the hood, USERELATIONSHIP works by temporarily overriding the active relationship during measure evaluation, using the specified column pair to filter the fact table. This function is evaluated at query time and does not alter the underlying model, making it ideal for scenarios like a Date dimension with multiple fact tables having different date columns (e.g., OrderDate and ShipDate). A subtle behavior is that USERELATIONSHIP can only be used with inactive relationships, and it cannot be nested or combined with CALCULATE modifiers that change filter context in conflicting ways.
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.
Prepare the data — This question tests Prepare the data — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use the USERELATIONSHIP function in the measure definition. — Option C is correct because the USERELATIONSHIP function in DAX allows you to temporarily activate an inactive relationship within a measure definition. This enables you to use a dimension table with multiple fact tables without changing the model's default active relationships or relying on user interactions. By specifying the inactive relationship in the measure, you can perform accurate aggregations across both fact tables while maintaining the intended data model structure.
What should I do if I get this PL-300 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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