- A
Use 'Replace Values' to replace null with 0
Directly replaces nulls with 0.
- B
Use 'Replace Errors' with value 0
Why wrong: Replace Errors handles errors, not nulls.
- C
Use 'Fill Down' to propagate previous values
Why wrong: Fill Down copies previous values, not 0.
- D
Add a custom column with an if statement
Why wrong: Adding a custom column is less efficient than direct replacement.
Question 525 of 966
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.
You are connecting to a SQL Server database using Import mode. The source table contains a column 'SalesAmount' with a few null values. You need to replace nulls with 0 before loading. What is the most efficient step to achieve this in Power Query Editor?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use 'Replace Values' to replace null with 0
Option A is correct because 'Replace Values' in Power Query Editor is the most efficient way to replace null values in a column with 0. It directly transforms the column in a single step without requiring additional logic or table scans, and it generates a clean M code step (Table.ReplaceValue) that operates natively on the column's nulls.
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.
- ✓
Use 'Replace Values' to replace null with 0
Why this is correct
Directly replaces nulls with 0.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use 'Replace Errors' with value 0
Why it's wrong here
Replace Errors handles errors, not nulls.
- ✗
Use 'Fill Down' to propagate previous values
Why it's wrong here
Fill Down copies previous values, not 0.
- ✗
Add a custom column with an if statement
Why it's wrong here
Adding a custom column is less efficient than direct replacement.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse 'Replace Values' with 'Replace Errors' or think nulls are errors, leading them to choose Option B, but nulls are a distinct data type (absence of value) and require a dedicated null-replacement operation.
Detailed technical explanation
How to think about this question
Under the hood, 'Replace Values' uses the Table.ReplaceValue M function, which performs an in-memory scan of the specified column and replaces nulls with 0 in a single pass, avoiding the overhead of adding a new column or iterating through rows with conditional logic. In real-world scenarios with large tables (millions of rows), this direct replacement is significantly faster than a custom column approach because it minimizes memory allocation and transformation steps. A subtle behavior: 'Replace Values' treats null as a distinct value type in Power Query, so it correctly identifies and replaces it without affecting blank strings or zero-length text.
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.
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FAQ
Questions learners often ask
What does this PL-300 question test?
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 'Replace Values' to replace null with 0 — Option A is correct because 'Replace Values' in Power Query Editor is the most efficient way to replace null values in a column with 0. It directly transforms the column in a single step without requiring additional logic or table scans, and it generates a clean M code step (Table.ReplaceValue) that operates natively on the column's nulls.
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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Last reviewed: Jul 4, 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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