Column operations (rename, remove, reorder) in Power BI - Cell-by-Cell Formula Trace

Sample Data

This table shows products with their IDs, names, categories, and prices.

Cell	Value
A1	ProductID
B1	ProductName
C1	Category
D1	Price
A2	101
B2	Pen
C2	Stationery
D2	1.5
A3	102
B3	Notebook
C3	Stationery
D3	3.0
A4	103
B4	Mug
C4	Kitchen
D4	5.0

Formula Trace

Table.RenameColumns(Table.RemoveColumns(Table.ReorderColumns(Source, {"ProductName", "Category", "Price", "ProductID"}), {"ProductID"}), {{"ProductName", "ItemName"}})

Step 1: Table.ReorderColumns(Source, {"ProductName", "Category", "Price", "ProductID"})

Step 2: Table.RemoveColumns(step1_result, {"ProductID"})

Step 3: Table.RenameColumns(step2_result, {{"ProductName", "ItemName"}})

Cell Reference Map

    A          B           C         D
1 ProductID  ProductName  Category  Price
2    101        Pen    Stationery    1.5
3    102    Notebook    Stationery    3.0
4    103        Mug      Kitchen     5.0

Arrows:
Source columns: A1:D4
Reorder uses B1, C1, D1, A1
Remove uses A1
Rename uses B1

The formula uses columns ProductName (B), Category (C), Price (D), ProductID (A) for reorder; removes ProductID (A); renames ProductName (B) to ItemName.

Result

    A         B          C
1 ItemName  Category   Price
2 Pen       Stationery  1.5
3 Notebook  Stationery  3.0
4 Mug       Kitchen    5.0

The final table shows columns reordered to ItemName (renamed from ProductName), Category, and Price. ProductID is removed.

Sheet Trace Quiz - 3 Questions

Which column is removed in the formula?

A Category

B ProductID

C Price

D ProductName

Key Result

Reorder columns, then remove unwanted columns, then rename columns as needed.

Practice

1.

What is the main purpose of renaming columns in Power BI's Power Query Editor?

easy

A. To give columns clear, meaningful names for easier understanding

B. To delete unwanted data from the table

C. To change the data type of the column

D. To create new calculated columns

Solution

1. Step 1: Understand column renaming

   Renaming columns means changing their names to something more descriptive or meaningful.

2. Step 2: Purpose of renaming

   This helps users and report viewers understand what data the column holds without confusion.

3. Final Answer:

   To give columns clear, meaningful names for easier understanding -> Option A

4. Quick Check:

   Renaming improves clarity = To give columns clear, meaningful names for easier understanding [OK]

Hint: Rename columns to clear names before loading data [OK]

Common Mistakes:

• Confusing renaming with deleting columns
• Thinking renaming changes data values
• Mixing renaming with changing data types

2.

Which of the following is the correct way to remove a column named SalesAmount in Power Query Editor?

easy

A. Rename the column to Remove

B. Double-click the SalesAmount column and type Delete

C. Drag the SalesAmount column to the end of the table

D. Right-click the SalesAmount column header and select Remove

Solution

1. Step 1: Identify how to remove columns in Power Query

   Removing a column is done by right-clicking its header and choosing the remove option.

2. Step 2: Check each option

   Only Right-click the SalesAmount column header and select Remove correctly describes this action. Double-clicking edits names, renaming doesn't remove, and dragging reorders columns.

3. Final Answer:

   Right-click the SalesAmount column header and select Remove -> Option D

4. Quick Check:

   Remove column = Right-click + Remove [OK]

Hint: Right-click column header to remove it quickly [OK]

Common Mistakes:

• Trying to delete by renaming
• Assuming double-click deletes column
• Dragging column removes it

3.

Given a table with columns Product, Sales, and Date, what will be the new column order after applying this step in Power Query Editor?

Table.ReorderColumns(Source, {"Date", "Product", "Sales"})

medium

A. ["Sales", "Date", "Product"]

B. ["Product", "Sales", "Date"]

C. ["Date", "Product", "Sales"]

D. ["Sales", "Product", "Date"]

Solution

1. Step 1: Understand Table.ReorderColumns function

   This function changes the order of columns to the list provided in the second argument.

2. Step 2: Apply the given list

   The list is ["Date", "Product", "Sales"], so the columns will be reordered exactly in that sequence.

3. Final Answer:

   ["Date", "Product", "Sales"] -> Option C

4. Quick Check:

   ReorderColumns list = new order [OK]

Hint: ReorderColumns sets columns exactly as listed [OK]

Common Mistakes:

• Assuming original order stays
• Mixing up column names order
• Ignoring the reorder list

4.

You tried to rename a column in Power Query Editor but got an error. Which of these is the most likely cause?

Table.RenameColumns(Source, {"Sales", "Revenue"})

medium

A. The source table must be empty before renaming

B. The rename list should be a list of lists like {{"Sales", "Revenue"}}

C. The new name must be numeric

D. You cannot rename columns in Power Query Editor

Solution

1. Step 1: Check syntax for Table.RenameColumns

   The function expects a list of pairs (old name, new name) inside another list, like {{"Old", "New"}}.

2. Step 2: Identify error cause

   The code uses a single pair without the outer list, causing a syntax error.

3. Final Answer:

   The rename list should be a list of lists like {{"Sales", "Revenue"}} -> Option B

4. Quick Check:

   RenameColumns needs list of lists [OK]

Hint: Use double braces {{old, new}} to rename columns [OK]

Common Mistakes:

• Using single list instead of list of lists
• Thinking renaming is not allowed
• Expecting numeric names only

5.

You have a table with columns ID, Name, Age, and Salary. You want to remove Age, rename Salary to Income, and reorder columns so Name comes first. Which sequence of Power Query steps is correct?

hard

A. Remove Age, Rename Salary to Income, Reorder columns to ["Name", "ID", "Income"]

B. Rename Salary to Income, Remove Age, Reorder columns to ["ID", "Name", "Income"]

C. Reorder columns to ["ID", "Name", "Salary", "Age"], Remove Age, Rename Salary to Income

D. Remove Name, Rename Age to Income, Reorder columns to ["ID", "Salary"]

Solution

1. Step 1: Remove the Age column

   First, remove the unwanted Age column to exclude it from the table.

2. Step 2: Rename Salary to Income

   Next, rename the Salary column to Income for clarity.

3. Step 3: Reorder columns with Name first

   Finally, reorder columns so Name is first, followed by ID and Income.

4. Final Answer:

   Remove Age, Rename Salary to Income, Reorder columns to ["Name", "ID", "Income"] -> Option A

5. Quick Check:

   Remove, Rename, Reorder in that order [OK]

Hint: Remove unwanted, rename needed, reorder last [OK]

Common Mistakes:

• Reordering before removing columns
• Renaming wrong columns
• Removing needed columns by mistake