The answer is to use a star schema design with fact and dimension tables. This is correct because a star schema organizes data into a central fact table containing measurable events, surrounded by dimension tables that provide descriptive context, which optimizes query performance and simplifies DAX calculations in Power BI. On the Microsoft Power BI Data Analyst PL-300 exam, this concept is frequently tested through scenario-based questions where you must identify which tables are facts versus dimensions, and a common trap is confusing normalized snowflake schemas with the simpler star schema. A key memory tip is to think of the star schema as a pizza: the fact table is the center slice, and each dimension table is a separate topping that adds flavor without duplicating the dough.
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.
Which THREE of the following are best practices for data modeling in Power BI? (Select exactly three.)
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 date table for time intelligence functions.
Option C is correct because Power BI's time intelligence functions (e.g., TOTALYTD, SAMEPERIODLASTYEAR) require a separate, continuous date table marked as a date table to work correctly. Without a dedicated date table, these functions may return incorrect results or fail due to missing contiguous dates. This table should have a single date column with no gaps and be related to the fact table's date column.
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 bi-directional cross-filtering relationships for all tables.
Why it's wrong here
Bi-directional should be used sparingly.
✗
Store calculated logic in calculated columns rather than measures when possible.
Why it's wrong here
Measures are more efficient for calculations.
✓
Create a separate date table for time intelligence functions.
Why this is correct
Enables proper time-based calculations.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✓
Hide the primary key columns in dimension tables from report view.
Why this is correct
Hides unnecessary fields from report creators.
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 star schema design with fact and dimension tables.
Why this is correct
Star schema is the recommended design.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often think bi-directional cross-filtering is a safe default (option A) or that calculated columns are always preferable for simplicity (option B), but the exam tests the understanding that these choices degrade performance and model clarity.
Detailed technical explanation
How to think about this question
Under the hood, Power BI uses the VertiPaq storage engine, which compresses data column-wise. Calculated columns are materialized and stored in memory, increasing model size, while measures are compiled into DAX query plans and computed on the fly. A star schema reduces the number of relationships and improves query performance by enabling filter propagation through one-to-many relationships without ambiguity. Hiding primary key columns prevents report consumers from inadvertently using them in visuals, which would cause incorrect aggregations or confusing row-level details.
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 separate date table for time intelligence functions. — Option C is correct because Power BI's time intelligence functions (e.g., TOTALYTD, SAMEPERIODLASTYEAR) require a separate, continuous date table marked as a date table to work correctly. Without a dedicated date table, these functions may return incorrect results or fail due to missing contiguous dates. This table should have a single date column with no gaps and be related to the fact table's date column.
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.
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.
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.