Sorting data in Power BI - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ dax_lod_result

intermediate

Sorting Sales by Month Name in Calendar Order

You have a table with sales data and a column 'MonthName' containing month names as text (e.g., January, February). You want to create a measure that returns total sales sorted by calendar month order, not alphabetically.

Which DAX expression correctly creates a calculated column to sort 'MonthName' in calendar order?

A MonthSort = RANKX(ALL('Calendar'[MonthName]), [MonthName], , ASC)

B MonthSort = MONTH(DATEVALUE([MonthName] & " 1"))

C MonthSort = IF([MonthName] = "January", 1, IF([MonthName] = "February", 2, IF([MonthName] = "March", 3, 0)))

D MonthSort = SWITCH([MonthName], "January", 1, "February", 2, "March", 3, "April", 4, "May", 5, "June", 6, "July", 7, "August", 8, "September", 9, "October", 10, "November", 11, "December", 12, 0)

💡 Hint

Think about assigning a number to each month name to represent its calendar order.

Option D uses SWITCH to assign each month name a number from 1 to 12, which can be used to sort months in calendar order. Option D tries to convert text to date but may fail if the locale or format is not recognized. Option D only covers three months and is incomplete. Option D ranks alphabetically, not calendar order.

❓ visualization

intermediate

Sorting a Bar Chart by Total Sales Descending

You created a bar chart showing total sales by product category. By default, the categories are sorted alphabetically. How do you sort the bars from highest to lowest total sales?

Choose the correct step to achieve this in Power BI.

A Click the vertical axis, then select 'Sort by' > 'Total Sales' and choose 'Descending'.

B Change the data type of the category column to numeric to enable sorting by sales.

C Create a new calculated column with sales rank and sort the category by this column.

D Sort the data table in Excel before importing to Power BI.

💡 Hint

Look for sorting options directly on the visual's axis or fields.

Option A is correct because Power BI allows sorting visuals by any measure by clicking the axis and choosing 'Sort by' with direction. Option A is incorrect because changing data type does not affect sorting by measure. Option A is more complex than needed. Option A is unnecessary if sorting can be done inside Power BI.

❓ data_modeling

advanced

Sorting a Text Column by Another Column in Power BI Model

You have a 'Product' table with a 'Category' column (text) and a 'CategorySortOrder' column (number). You want the 'Category' column to be sorted by 'CategorySortOrder' in all visuals.

What is the correct way to set this up in Power BI?

A Rename 'CategorySortOrder' to 'Category' to replace the original column.

B Create a measure that returns 'CategorySortOrder' and use it to sort 'Category'.

C Select the 'Category' column in the model, then use 'Sort by Column' and choose 'CategorySortOrder'.

D Sort the 'Category' column alphabetically and ignore 'CategorySortOrder'.

💡 Hint

Power BI allows sorting one column by another column in the data model.

Option C is correct because Power BI has a 'Sort by Column' feature to sort text columns by numeric columns. Option C is invalid because measures cannot be used to sort columns. Option C would lose original data. Option C ignores the requirement.

🔧 Formula Fix

advanced

Debugging Incorrect Sorting of Weekday Names

You created a calculated column 'WeekdaySort' to sort weekday names in calendar order, but the sorting is incorrect in your report.

Here is the DAX code you wrote:

WeekdaySort = SWITCH([WeekdayName], "Monday", 1, "Tuesday", 2, "Wednesday", 3, "Thursday", 4, "Friday", 5, "Saturday", 6)

Why is the sorting wrong?

A The SWITCH function syntax is incorrect and causes a syntax error.

B The SWITCH statement is missing the 'Sunday' case, so Sunday returns BLANK() and sorts first.

C Weekday names must be numbers, not text, to sort correctly.

D The calculated column must use IF instead of SWITCH for sorting.

💡 Hint

Check if all possible weekday names are covered in the SWITCH statement.

Option B is correct because Sunday is missing from the SWITCH cases, so it returns BLANK(), which sorts before 1. This causes Sunday to appear first instead of last. Option B is wrong because syntax is correct. Option B is false; text can be sorted by numeric columns. Option B is incorrect; SWITCH is appropriate here.

🧠 Conceptual

expert

Understanding Sorting Behavior with Multiple Sort Columns

In Power BI, you want to sort a table visual by two columns: first by 'Region' alphabetically, then by 'Sales' descending within each region.

Which statement best describes how to achieve this sorting?

A Sort the visual first by 'Region' ascending, then hold Ctrl and sort by 'Sales' descending to apply multi-level sorting.

B Power BI does not support multi-column sorting in visuals; you must sort by one column only.

C Create a new calculated column combining 'Region' and 'Sales' and sort by that column.

D Sort the data source table externally before importing to Power BI.

💡 Hint

Try using Ctrl key to add multiple sort levels in the visual.

Option A is correct because Power BI allows multi-column sorting in visuals by sorting one column, then holding Ctrl and sorting another. Option A is complex and unnecessary. Option A is false; multi-column sorting is supported. Option A is not required.