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 need to create a calculated column that categorizes sales amounts into 'Low', 'Medium', and 'High' based on thresholds. Which DAX expression should you use?
Option A is correct because it uses SWITCH(TRUE(), ...) to evaluate multiple conditions sequentially, returning the first matching result. This is the standard pattern for categorizing continuous values into discrete buckets in DAX, as SWITCH evaluates conditions in order and stops at the first TRUE condition.
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.
SWITCH without TRUE() checks exact matches, not ranges.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Microsoft often tests the distinction between SWITCH with exact matching (Option D) and SWITCH with TRUE() for range-based logic, leading candidates to choose the simpler-looking SWITCH without TRUE() and miss the range evaluation.
Detailed technical explanation
How to think about this question
SWITCH(TRUE(), ...) works by evaluating each condition as a Boolean expression; the first condition that evaluates to TRUE determines the result. This pattern is more efficient than nested IFs because DAX can optimize the evaluation, and it avoids deep nesting that can become hard to read. In real-world scenarios, you might also use this pattern with variables to avoid repeated calculations, e.g., VAR _Amount = Sales[Amount] RETURN SWITCH(TRUE(), _Amount < 100, ...).
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
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.
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: SWITCH(TRUE(), Sales[Amount] < 100, "Low", Sales[Amount] < 500, "Medium", "High") — Option A is correct because it uses SWITCH(TRUE(), ...) to evaluate multiple conditions sequentially, returning the first matching result. This is the standard pattern for categorizing continuous values into discrete buckets in DAX, as SWITCH evaluates conditions in order and stops at the first TRUE condition.
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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