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 preparing a data model that uses a date table. You need to ensure that the date table includes all dates from January 1, 2020 to December 31, 2025. What is the most efficient way to create this date table in Power Query?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use the 'List.Dates' function to generate the date range.
Option B is correct because the 'List.Dates' function in Power Query M is the most efficient way to generate a contiguous range of dates directly within the query editor, without external dependencies. It creates a list of dates from a start date to an end date using a specified step (e.g., #duration(1,0,0,0) for one day), which can then be converted into a table. This approach is lightweight, fully self-contained, and avoids the overhead of importing external files or using DAX functions that are not native to Power Query.
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.
✗
Import a date table from an Excel file.
Why it's wrong here
Possible but less efficient and not dynamic.
✓
Use the 'List.Dates' function to generate the date range.
Why this is correct
List.Dates generates a list of dates given start, count, and step.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use the 'Calendar' function in Power Query M.
Why it's wrong here
There is no 'Calendar' function in M; you use List.Dates.
✗
Use the 'CALENDAR' DAX function in Power Query.
Why it's wrong here
CALENDAR is a DAX function, not available in Power Query.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse DAX functions (like 'CALENDAR') with Power Query M functions, assuming they can be used interchangeably in the Power Query editor, when in fact DAX functions are only available in the data modeling layer (e.g., calculated tables) and not in Power Query.
Detailed technical explanation
How to think about this question
The 'List.Dates' function generates a list of dates by incrementing a start date using a specified duration step, which is efficient for large ranges because it creates the list in memory without iterative row-by-row operations. A subtle behavior is that the step parameter uses a #duration value, so to generate daily dates you must use #duration(1,0,0,0); using #duration(0,1,0,0) would increment by months instead. In real-world scenarios, this method is preferred for date tables in Power BI because it ensures the date range is exactly controlled and can be parameterized, avoiding issues with missing dates in imported data.
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: Use the 'List.Dates' function to generate the date range. — Option B is correct because the 'List.Dates' function in Power Query M is the most efficient way to generate a contiguous range of dates directly within the query editor, without external dependencies. It creates a list of dates from a start date to an end date using a specified step (e.g., #duration(1,0,0,0) for one day), which can then be converted into a table. This approach is lightweight, fully self-contained, and avoids the overhead of importing external files or using DAX functions that are not native to Power Query.
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.
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Question Discussion
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