The correct choice is to create a separate Product dimension table with category, related to the Sales fact table by ProductID. This design supports filtering the fact table by a dimension attribute because in a star schema, dimension tables are normalized and linked to the fact table via a common key, allowing efficient slicing of sales data by product category without data redundancy. On the PL-300 exam, this tests your understanding of star schema fundamentals versus flat or denormalized designs; a common trap is choosing to store the category directly in the fact table, which inflates storage and degrades performance. Remember the mnemonic “Dimensions filter, facts measure” — keep descriptive attributes in separate dimension tables to enable clean, fast filtering.
PL-300 Model the data Practice Question
This PL-300 practice question tests your understanding of model 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 star schema in Power BI. Which table design best supports filtering a sales fact table by product category?
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 separate Product dimension table with category, related to Sales by ProductID.
Option B is correct because in a star schema, dimension tables like Product are separate from fact tables. Relating Product to Sales by a common key (ProductID) enables filtering of sales by category. Option A is wrong because storing category directly in the fact table leads to redundancy and poor performance. Option C is wrong because a single table with all data is a flat table, not a star schema. Option D is wrong because merging into one table removes the benefits of star schema design.
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 a single table containing all sales and product attributes.
Why it's wrong here
Flat schema, not a star schema; leads to poor performance.
✗
Merge Sales and Product tables into one by appending rows.
Why it's wrong here
Merging tables incorrectly; should relate via relationships, not merging.
✓
Create a separate Product dimension table with category, related to Sales by ProductID.
Why this is correct
Star schema design; enables filtering and reduces redundancy.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Store product category in the Sales fact table.
Why it's wrong here
Redundant and violates normalization; increases storage and maintenance.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
What to study next
Got this wrong? Here's your next step.
Identify which PL-300 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Model the data — This question tests Model 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 separate Product dimension table with category, related to Sales by ProductID. — Option B is correct because in a star schema, dimension tables like Product are separate from fact tables. Relating Product to Sales by a common key (ProductID) enables filtering of sales by category. Option A is wrong because storing category directly in the fact table leads to redundancy and poor performance. Option C is wrong because a single table with all data is a flat table, not a star schema. Option D is wrong because merging into one table removes the benefits of star schema design.
What should I do if I get this PL-300 question wrong?
Identify which PL-300 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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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Question Discussion
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