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 THREE data types are supported in Power Query for Power BI?
Array
Why wrong: Array is not a primitive data type in Power Query.
Decimal Number
Decimal Number is supported for fractional numbers.
Object
Why wrong: Object is not a data type in Power Query.
Text
Text is a fundamental data type in Power Query.
Boolean
Boolean (true/false) is supported.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Decimal Number
Power Query supports a specific set of primitive data types for columns in Power BI, including Decimal Number, Text, and Boolean. These types are used to define the structure and behavior of data during transformation and loading, ensuring compatibility with the Power BI engine.
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.
Array
Why it's wrong here
Array is not a primitive data type in Power Query.
Decimal Number
Why this is correct
Decimal Number is supported for fractional numbers.
Related concept
Read the scenario before looking for a memorised answer.
Object
Why it's wrong here
Object is not a data type in Power Query.
Text
Why this is correct
Text is a fundamental data type in Power Query.
Related concept
Read the scenario before looking for a memorised answer.
Boolean
Why this is correct
Boolean (true/false) is supported.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
The trap here is that candidates often confuse general programming data types (like Array or Object) with Power Query's specific type system, leading them to select options that are not valid in the M language or Power BI's data model.
Detailed technical explanation
Under the hood, Power Query's type system is based on the M language, which defines types like number (including Decimal), text, logical (Boolean), and others such as date, time, and duration. Decimal Number is stored as a 128-bit floating-point value, providing high precision for financial calculations, while Boolean is a two-value logical type used in conditional logic. A real-world scenario: when importing sales data, you must explicitly set the data type of a 'Price' column to Decimal Number to avoid rounding errors in aggregations.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
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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: Decimal Number — Power Query supports a specific set of primitive data types for columns in Power BI, including Decimal Number, Text, and Boolean. These types are used to define the structure and behavior of data during transformation and loading, ensuring compatibility with the Power BI engine.
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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