The correct answer is to create a bridge table containing unique combinations of OrderID and CampaignID. This approach resolves the many-to-many relationship bridge table Power BI scenario, where the Sales table and Marketing table share no direct key, preventing a standard one-to-many relationship. By building a bridge table that lists every distinct pairing of OrderID and CampaignID, you enable Power BI to traverse the relationship correctly, allowing accurate analysis of campaign effectiveness without inflating row counts or creating ambiguous aggregations. On the Microsoft Power BI Data Analyst PL-300 exam, this question tests your understanding of modeling complex relationships, a common trap being the temptation to create a direct relationship between the two fact tables, which would cause incorrect filtering. Instead, remember the bridge table acts as an intermediary, linking both sides without duplication. A useful memory tip: “Bridge the gap, don’t force the link”—when keys don’t match directly, a bridge table is your go-to solution for clean many-to-many modeling.
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 that combines Sales data from SQL Server and Marketing data from a CSV file. The Sales table has a unique 'OrderID' column, and the Marketing table has a 'CampaignID' column. You need to create a relationship between Sales and Marketing to analyze campaign effectiveness. 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
✓
Create a bridge table containing unique combinations of OrderID and CampaignID.
Option B is correct because a bridge table resolves the many-to-many relationship between Sales (OrderID) and Marketing (CampaignID). Since there is no direct key match, creating a bridge table with unique combinations of OrderID and CampaignID allows Power BI to model the relationship correctly and analyze campaign effectiveness without data duplication or ambiguity.
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.
✗
Use an inactive relationship between Sales and Marketing and activate it with USERELATIONSHIP in measures.
Why it's wrong here
Inactive relationships are for role-playing dimensions, not for many-to-many scenarios.
✓
Create a bridge table containing unique combinations of OrderID and CampaignID.
Why this is correct
A bridge table properly resolves the many-to-many relationship between Sales and Marketing.
Related concept
Read the scenario before looking for a memorised answer.
✗
Create a separate table for each campaign and relate to Sales.
Why it's wrong here
A separate table per campaign is not scalable and violates normalization principles.
✗
Merge the Marketing table into the Sales table using a left outer join.
Why it's wrong here
Merging tables combines different grains, causing data duplication and incorrect aggregation.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume an inactive relationship or a merge can handle mismatched keys, but Power BI requires a common key column for relationships, and merging destroys the normalized model needed for accurate many-to-many analysis.
Trap categories for this question
Scenario analysis trap
Inactive relationships are for role-playing dimensions, not for many-to-many scenarios.
Detailed technical explanation
How to think about this question
A bridge table acts as an intermediate table that stores the unique combinations of keys from both sides, enabling a many-to-many relationship in Power BI's data model. Under the hood, Power BI uses the bridge table to filter both Sales and Marketing tables independently, ensuring correct aggregation without fanning out data. In real-world scenarios, this pattern is essential when analyzing sales attributed to multiple marketing campaigns, such as when an order is influenced by both an email campaign and a social media ad.
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: Create a bridge table containing unique combinations of OrderID and CampaignID. — Option B is correct because a bridge table resolves the many-to-many relationship between Sales (OrderID) and Marketing (CampaignID). Since there is no direct key match, creating a bridge table with unique combinations of OrderID and CampaignID allows Power BI to model the relationship correctly and analyze campaign effectiveness without data duplication or ambiguity.
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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
This PL-300 practice question is part of Courseiva's free Microsoft certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the PL-300 exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.