The correct answer is that marking a date table enables time intelligence functions like TOTALYTD and requires the table to have a unique date column. This feature works by explicitly telling Power BI which table contains the continuous, unique dates needed for functions such as DATESYTD or SAMEPERIODLASTYEAR, ensuring that time-based calculations respect the calendar hierarchy rather than relying on an auto-generated date table. On the PL-300 exam, this concept often appears in scenario-based questions where you must identify why a time intelligence measure returns an error, with the common trap being that simply creating a relationship between a date column and a fact table is not enough—you must also mark the date table. Remember that the date column must contain no duplicates and cover all dates in your data, otherwise time intelligence will fail. A quick memory tip: “Mark it unique to time-travel your data.”
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.
Which TWO of the following are true about using the 'Mark as Date Table' feature in Power BI?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The date table must have a column with unique date values
Option A and D are correct. Option A is correct because marking a date table enables time intelligence functions. Option D is correct because the date table must have a unique date column. Option B is wrong because the date column must contain unique dates. Option C is wrong because marking a date table is not required for relationships, but it enables automatic time intelligence. Option E is wrong because marking a date table does not automatically add all date columns.
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.
✗
It is required for any relationship involving a date column
Why it's wrong here
Not required for relationships.
✗
The date column can contain duplicate dates
Why it's wrong here
Must be unique.
✓
The date table must have a column with unique date values
Why this is correct
The date column must be unique.
Related concept
Read the scenario before looking for a memorised answer.
✗
It automatically creates all date hierarchy columns (Year, Quarter, Month, Day)
Why it's wrong here
It does not automatically create columns; you must add them.
✓
It enables time intelligence functions like TOTALYTD
Why this is correct
Time intelligence functions require a marked date table.
Related concept
Read the scenario before looking for a memorised answer.
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
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 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: The date table must have a column with unique date values — Option A and D are correct. Option A is correct because marking a date table enables time intelligence functions. Option D is correct because the date table must have a unique date column. Option B is wrong because the date column must contain unique dates. Option C is wrong because marking a date table is not required for relationships, but it enables automatic time intelligence. Option E is wrong because marking a date table does not automatically add all date columns.
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.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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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
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