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 need to combine data from two tables in Power Query that have the same columns but different row sets. Which operation should you use?
Union Queries
Why wrong: Not a standard Power Query term.
Group By
Why wrong: Groups rows and aggregates.
Append Queries
Appends rows from second table to first.
Merge Queries
Why wrong: Merges columns based on key.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Append Queries
Append Queries is the correct operation in Power Query when you need to combine two tables with identical columns but different row sets. It stacks the rows from the second table beneath the rows from the first table, effectively performing a union of the data. This is distinct from Merge Queries, which joins columns based on a key, and Group By, which aggregates data.
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.
Union Queries
Why it's wrong here
Not a standard Power Query term.
Group By
Why it's wrong here
Groups rows and aggregates.
Append Queries
Why this is correct
Appends rows from second table to first.
Related concept
Read the scenario before looking for a memorised answer.
Merge Queries
Why it's wrong here
Merges columns based on key.
Common exam traps
The trap here is that candidates confuse 'Merge Queries' (which adds columns) with 'Append Queries' (which adds rows), especially since the term 'Union' is commonly used in SQL but is not the exact Power Query operation name.
Detailed technical explanation
Under the hood, Append Queries in Power Query generates a Table.Combine M code that concatenates the row sets, preserving all columns from both tables. If column names differ, Power Query will still append but may create new columns or null values, so ensuring identical column names is critical. A real-world scenario is combining monthly sales data from separate Excel sheets where each sheet has the same structure—Append Queries efficiently builds a single unified table for analysis.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
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FAQ
Prepare the data — This question tests Prepare the data — Read the scenario before looking for a memorised answer..
The correct answer is: Append Queries — Append Queries is the correct operation in Power Query when you need to combine two tables with identical columns but different row sets. It stacks the rows from the second table beneath the rows from the first table, effectively performing a union of the data. This is distinct from Merge Queries, which joins columns based on a key, and Group By, which aggregates data.
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
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