Power BI Interview Prep Q2: Merge vs Append Queries Explained with Example
What is the difference between Merge and Append queries in Power BI Power Query?
If you are preparing for a Data Analyst or Power BI interview, this is one of the most frequently asked questions for freshers! In this video, we break down Merge vs Append queries using a simple, practical example so you can explain it confidently to any interviewer.
Key Takeaways:
Append Queries: Adds data vertically (Adds Rows 👇). Stacks tables on top of each other.
Merge Queries: Adds data horizontally (Adds Columns 👉) based on a matching key column (like VLOOKUP or SQL Joins).
Timestamps:
0:00 - Why Interviewers Ask Merge vs Append
0:20 - What is Append Query? (With Example)
2:42 - What is Merge Query? (With Example)
5:33 - Quick Summary for Interviews
Practice Data Tables Used in This Video:
Table 1: Jan_Sales (Products P01 to P04)
SaleID | ProductID | Quantity | Revenue
101 | P01 | 5 | 4000
102 | P02 | 2 | 40
103 | P03 | 4 | 200
104 | P04 | 1 | 150
Table 2: Feb_Sales (Products P04 to P08)
SaleID | ProductID | Quantity | Revenue
107 | P04 | 2 | 300
108 | P05 | 1 | 1200
109 | P06 | 10 | 150
Table 3: Product_Details (Master Lookup Table)
ProductID | ProductName | Category | Price
P01 | Laptop | Electronics | 800
P02 | Mouse | Accessories | 20
P03 | Keyboard | Accessories | 50
P04 | Monitor | Electronics | 150
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Drop your questions or tell me what topic you want next in the comments below! 👇
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