The answer is that the FILTER function overrides the slicer filter context. This happens because when you use FILTER inside a CALCULATE statement, it acts as a table modifier that replaces any existing external filters on the specified column, such as those from a slicer on 'Sales[Date]'. In DAX, explicit filter arguments within CALCULATE always take precedence over the surrounding filter context, so the slicer selection is effectively ignored. On the PL-300 exam, this question tests your understanding of filter context precedence and the behavior of CALCULATE modifiers, often appearing as a common trap where candidates assume slicers always apply. A reliable memory tip is: “Explicit beats implicit—if you FILTER inside CALCULATE, the slicer will abdicate.”
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.
Exhibit
Refer to the exhibit.
```dax
CALCULATE(
SUM(Sales[Amount]),
FILTER(
Sales,
Sales[Date] >= DATE(2024,1,1) && Sales[Date] <= DATE(2024,12,31)
)
)
```
Refer to the exhibit. You are reviewing a DAX measure in Power BI. The measure is intended to calculate total sales for the year 2024. However, when used in a visual with a slicer on 'Sales[Date]', the measure does not respect the slicer selection. What is the most likely reason?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The FILTER function overrides the slicer filter context.
Option A is correct because the FILTER function in the measure creates a new filter context that overrides the existing slicer filter context on 'Sales[Date]'. When CALCULATE evaluates the expression, it applies the FILTER as a table modifier, which replaces any external filters on the Date column, causing the slicer to be ignored. This is a common DAX behavior where explicit filter arguments in CALCULATE take precedence over existing filter contexts.
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.
✓
The FILTER function overrides the slicer filter context.
Why this is correct
FILTER within CALCULATE replaces the existing filter on the Sales table, ignoring the slicer.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The CALCULATE function removes all filters by default.
Why it's wrong here
CALCULATE does not remove filters unless REMOVEFILTERS or ALL is used.
✗
The measure should use ALL(Sales[Date]) to respect slicers.
Why it's wrong here
Using ALL would remove the slicer filter, making the issue worse.
✗
The DATE function syntax is incorrect.
Why it's wrong here
The DATE syntax is correct.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume CALCULATE always respects slicers, but they miss that explicit filter arguments (like FILTER) override external filters on the same columns, leading to the slicer being ignored.
Detailed technical explanation
How to think about this question
Under the hood, CALCULATE performs context transition and applies filter arguments as new filter contexts that override existing ones on the same columns unless KEEPFILTERS is used. The FILTER function iterates over a table and returns a logical condition, which when used as a CALCULATE filter, becomes a static filter that replaces any dynamic slicer selections on 'Sales[Date]'. In real-world scenarios, this pattern is often used to create fixed time intelligence measures (e.g., 'Sales YTD') that should not be affected by date slicers, but here it inadvertently breaks the intended slicer interaction.
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: The FILTER function overrides the slicer filter context. — Option A is correct because the FILTER function in the measure creates a new filter context that overrides the existing slicer filter context on 'Sales[Date]'. When CALCULATE evaluates the expression, it applies the FILTER as a table modifier, which replaces any external filters on the Date column, causing the slicer to be ignored. This is a common DAX behavior where explicit filter arguments in CALCULATE take precedence over existing filter contexts.
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: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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