Quick Answer
The answer is that the date table must be marked as a date table in Power BI. This is critical because time intelligence functions like TOTALYTD rely on a continuous, unique date column to correctly calculate periods such as year-to-date, quarter-to-date, or same-period-last-year. Without explicitly marking the table via the 'Mark as Date Table' option in the Table tools ribbon, Power BI cannot guarantee the date column has no gaps or duplicates, which would break the internal calendar logic these functions depend on. On the PL-300 exam, this requirement often appears as a distractor where candidates assume any date column works, but the trap is that a date table must be formally designated—simply having a date column in the model is insufficient. A useful memory tip is "Mark it to make it work": if you want time intelligence to respect your custom date table, you must first mark it as a date table in the modeling view.
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 have a Power BI model with a date table. You need to ensure that time intelligence functions like TOTALYTD work correctly. What is the most important requirement for the date table?
The date table must be marked as a date table in Power BI
Marking as date table enables time intelligence.
All date columns must be visible
Why wrong: Visibility is not the key requirement.
The date table must have a single date column
Why wrong: Multiple date columns are not an issue.
The date table must contain continuous dates without gaps
Why wrong: Gaps are allowed; marking is required.
Answer choices
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 be marked as a date table in Power BI
Option A is correct because Power BI requires that a date table be explicitly marked as a date table via the 'Mark as Date Table' option in the Table tools ribbon. This action tells Power BI that the table contains unique, non-blank date values that can be used by time intelligence functions like TOTALYTD, ensuring they reference the correct date column for calculations such as year-to-date aggregation.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
The date table must be marked as a date table in Power BI
Why this is correct
Marking as date table enables time intelligence.
Related concept
Read the scenario before looking for a memorised answer.
All date columns must be visible
Why it's wrong here
Visibility is not the key requirement.
The date table must have a single date column
Why it's wrong here
Multiple date columns are not an issue.
The date table must contain continuous dates without gaps
Why it's wrong here
Gaps are allowed; marking is required.
Common exam traps
The trap here is that candidates often confuse the requirement to mark a date table with the best practice of having continuous dates, leading them to select Option D, but Power BI does not enforce date continuity for time intelligence functions to work.
Detailed technical explanation
Under the hood, marking a table as a date table creates a relationship between the date column and the model's date fields, enabling DAX time intelligence functions to generate correct filter contexts. A subtle behavior is that if the date table is not marked, functions like TOTALYTD may return incorrect results or errors because they rely on a continuous date range defined by the marked table. In real-world scenarios, using a fiscal calendar requires marking a date table that includes fiscal year columns, ensuring TOTALYTD respects the fiscal year start date.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
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FAQ
Model the data — This question tests Model the data — Read the scenario before looking for a memorised answer..
The correct answer is: The date table must be marked as a date table in Power BI — Option A is correct because Power BI requires that a date table be explicitly marked as a date table via the 'Mark as Date Table' option in the Table tools ribbon. This action tells Power BI that the table contains unique, non-blank date values that can be used by time intelligence functions like TOTALYTD, ensuring they reference the correct date column for calculations such as year-to-date aggregation.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
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.
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