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.
Which TWO options are valid methods to combine multiple tables in Power Query?
Join
Why wrong: Join is not a specific Power Query transformation; Merge serves that purpose.
Concatenate
Why wrong: Concatenate combines text values, not tables.
Merge
Merge combines tables horizontally based on a key.
Union
Why wrong: Union is a DAX function, not available in Power Query.
Append
Append combines tables vertically.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Merge
Option C (Merge) is correct because Merge in Power Query performs a join-like operation that combines columns from two tables based on a matching key, similar to SQL JOINs. Option E (Append) is correct because Append stacks rows from multiple tables with the same columns, akin to SQL UNION ALL. Both are native Power Query operations for combining tables.
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.
Join
Why it's wrong here
Join is not a specific Power Query transformation; Merge serves that purpose.
Concatenate
Why it's wrong here
Concatenate combines text values, not tables.
Merge
Why this is correct
Merge combines tables horizontally based on a key.
Related concept
Read the scenario before looking for a memorised answer.
Union
Why it's wrong here
Union is a DAX function, not available in Power Query.
Append
Why this is correct
Append combines tables vertically.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
The trap here is that candidates confuse SQL terminology (Join, Union) with Power Query's specific functions (Merge, Append), leading them to select the generic terms instead of the correct Power Query operations.
Detailed technical explanation
Under the hood, Merge uses the M function Table.Join or Table.NestedJoin to create a new table with columns from both sources, supporting join kinds like Left Outer, Inner, and Full Outer. Append uses Table.Combine or Table.CombineColumns to stack tables, requiring identical column structures. A real-world scenario: merging sales data with product details using a ProductID key, or appending monthly sales tables into a yearly table.
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: Merge — Option C (Merge) is correct because Merge in Power Query performs a join-like operation that combines columns from two tables based on a matching key, similar to SQL JOINs. Option E (Append) is correct because Append stacks rows from multiple tables with the same columns, akin to SQL UNION ALL. Both are native Power Query operations for combining tables.
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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