Applied steps and undo in Power BI - Cheat Sheet & Quick Revision

Recall & Review

beginner

What are Applied Steps in Power BI Query Editor?

Applied Steps are the list of actions you perform on your data in Query Editor. Each step records a change like filtering, renaming, or adding columns. They help you track and modify your data cleaning process easily.

beginner

How can you undo a change in Power BI Query Editor?

You can undo a change by deleting the last Applied Step in the Query Settings pane. This removes the most recent action and reverts your data to the previous state.

intermediate

Why is it important to keep track of Applied Steps?

Tracking Applied Steps helps you understand your data transformation process, makes it easy to fix mistakes, and allows you to update or change steps without starting over.

intermediate

Can you reorder Applied Steps in Power BI Query Editor? Why or why not?

No, you cannot reorder Applied Steps because each step depends on the previous one. Changing the order can break the data transformation logic.

advanced

What happens if you delete an Applied Step in the middle of the list?

Deleting a step in the middle removes that action and all steps after it. Power Query recalculates the data from the remaining steps, so be careful to avoid losing important transformations.

What does an Applied Step represent in Power BI Query Editor?

A A recorded data transformation action

B A saved report page

C A visual chart type

D A data source connection

Applied Steps record each change you make to your data in Query Editor.

How do you undo the last change in Power BI Query Editor?

A Rename the query

B Close and reopen Power BI

C Refresh the data source

D Delete the last Applied Step

Deleting the last Applied Step removes the most recent change.

Can you reorder Applied Steps in Power BI Query Editor?

A Yes, by dragging steps

B No, because steps depend on order

C Yes, by renaming steps

D No, because steps are locked

Applied Steps must stay in order because each depends on the previous.

What happens if you delete an Applied Step in the middle of the list?

A Only that step is removed

B The query refreshes automatically

C All steps after it are also removed

D Nothing changes

Deleting a middle step removes it and all steps after it.

Why is it useful to keep Applied Steps visible?

A To track and edit data transformations easily

B To create new reports

C To connect to new data sources

D To change chart colors

Applied Steps help you track and adjust your data cleaning process.

Explain what Applied Steps are and how they help in Power BI Query Editor.

Think about how each action you do on data is recorded.

Describe the process and effects of undoing an Applied Step in Power BI.

Consider what happens when you remove a step from the list.

Practice

1. What is the main purpose of Applied Steps in Power BI's Query Editor?

easy

A. To write DAX formulas for calculations

B. To create visualizations automatically

C. To track and record every change made to the data during cleaning

D. To connect Power BI to external databases

Solution

1. Step 1: Understand Applied Steps function

   Applied Steps record each transformation or change you make to your data in Query Editor.

2. Step 2: Differentiate from other features

   Applied Steps do not create visuals, write formulas, or connect databases; they track data cleaning actions.

3. Final Answer:

   To track and record every change made to the data during cleaning -> Option C

4. Quick Check:

   Applied Steps = Track changes [OK]

Hint: Applied Steps = your data cleaning history [OK]

Common Mistakes:

• Confusing Applied Steps with visualization features
• Thinking Applied Steps write formulas
• Assuming Applied Steps connect to databases

2. Which of the following is the correct way to undo the last applied step in Power BI Query Editor?

easy

A. Click the 'X' next to the last step in the Applied Steps pane

B. Press Ctrl + Z anywhere in Power BI Desktop

C. Delete the entire query and start over

D. Right-click the data table and select 'Undo'

Solution

1. Step 1: Locate Applied Steps pane

   The Applied Steps pane shows each change; each step has an 'X' to remove it.

2. Step 2: Undo last step by removing it

   Clicking the 'X' next to the last step removes that change, effectively undoing it.

3. Final Answer:

   Click the 'X' next to the last step in the Applied Steps pane -> Option A

4. Quick Check:

   Undo last step = Click 'X' [OK]

Hint: Undo last step by clicking 'X' in Applied Steps [OK]

Common Mistakes:

• Using Ctrl + Z which doesn't undo Query Editor steps
• Deleting entire query unnecessarily
• Looking for undo option outside Applied Steps

3. Given these Applied Steps in Power BI Query Editor:
1. Source
2. Removed Columns
3. Filtered Rows

If you click the 'X' next to Removed Columns, what will happen?

medium

A. Both 'Removed Columns' and 'Filtered Rows' steps will be deleted

B. 'Removed Columns' step will be deleted, and 'Filtered Rows' will be recalculated without it

C. Only 'Filtered Rows' step will be deleted

D. Nothing will change because you cannot delete middle steps

Solution

1. Step 1: Understand step dependencies

   Deleting a middle step removes that transformation; later steps recalculate based on remaining steps.

2. Step 2: Effect on later steps

   'Filtered Rows' depends on the data after 'Removed Columns'; it will recalculate using data without that removal.

3. Final Answer:

   'Removed Columns' step will be deleted, and 'Filtered Rows' will be recalculated without it -> Option B

4. Quick Check:

   Deleting middle step recalculates later steps [OK]

Hint: Deleting a step recalculates all following steps [OK]

Common Mistakes:

• Assuming all later steps delete automatically
• Thinking middle steps cannot be deleted
• Believing nothing changes after deletion

4. You accidentally removed a column in Power BI Query Editor but did not want to. Which of these is the best way to fix it?

medium

A. Create a new query from scratch

B. Close Power BI without saving and reopen the file

C. Manually add the column back using DAX

D. Undo the removal by deleting the 'Removed Columns' step in Applied Steps

Solution

1. Step 1: Identify the mistake step

   The 'Removed Columns' step is where the column was removed.

2. Step 2: Undo by deleting the step

   Deleting this step in Applied Steps will restore the column as if it was never removed.

3. Final Answer:

   Undo the removal by deleting the 'Removed Columns' step in Applied Steps -> Option D

4. Quick Check:

   Undo mistake by deleting step [OK]

Hint: Fix mistakes by deleting wrong Applied Steps [OK]

Common Mistakes:

• Closing without saving loses all work
• Trying to add columns with DAX instead of Query Editor
• Rebuilding query unnecessarily

5. You applied these steps in order:
1. Changed Type
2. Filtered Rows
3. Added Custom Column

Later you realize the 'Changed Type' step was incorrect. What is the best approach to fix this without losing your custom column?

hard

A. Delete the 'Changed Type' step and then reapply it correctly before the other steps

B. Delete all steps and start over from the source

C. Edit the 'Added Custom Column' step to fix the type issue

D. Ignore the error and proceed with the current steps

Solution

1. Step 1: Remove incorrect 'Changed Type' step

   Delete the wrong 'Changed Type' step to remove the incorrect data type changes.

2. Step 2: Reapply correct 'Changed Type' step before other steps

   Reapply the correct type changes before 'Filtered Rows' and 'Added Custom Column' to keep data consistent.

3. Final Answer:

   Delete the 'Changed Type' step and then reapply it correctly before the other steps -> Option A

4. Quick Check:

   Fix errors by correcting early steps without losing later ones [OK]

Hint: Fix early step errors by deleting and reapplying them [OK]

Common Mistakes:

• Deleting all steps loses work
• Editing later steps to fix early errors
• Ignoring errors causes wrong data