SWITCH function in Power BI - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ dax_lod_result

intermediate

Output of SWITCH with numeric expression

What is the result of this DAX measure?

Measure = SWITCH(2, 1, "One", 2, "Two", 3, "Three", "Other")

Power BI

Measure = SWITCH(2, 1, "One", 2, "Two", 3, "Three", "Other")

A "One"

B "Three"

C "Two"

D "Other"

💡 Hint

SWITCH compares the first argument to each value in pairs.

The SWITCH function compares the first argument (2) to each value (1, 2, 3). It matches 2, so returns "Two".

🎯 Scenario

intermediate

Using SWITCH for category labels

You have a sales table with a column 'RegionCode' containing values 1, 2, or 3. You want a measure that returns "North" for 1, "South" for 2, "East" for 3, and "Unknown" otherwise.

Which DAX expression correctly implements this?

A RegionName = SWITCH(TRUE(), [RegionCode] = "1", "North", [RegionCode] = "2", "South", [RegionCode] = "3", "East", "Unknown")

B RegionName = SWITCH(TRUE(), [RegionCode] = 1, "North", [RegionCode] = 2, "South", [RegionCode] = 3, "East", "Unknown")

C RegionName = SWITCH([RegionCode], "1", "North", "2", "South", "3", "East", "Unknown")

D RegionName = SWITCH([RegionCode], 1, "North", 2, "South", 3, "East", "Unknown")

💡 Hint

Match the numeric RegionCode directly without TRUE() when comparing values.

Option D correctly uses SWITCH with the expression [RegionCode] and matches numeric values 1, 2, 3. Options C and D compare to strings which won't match numeric codes. Option D uses SWITCH(TRUE()) but compares numeric values without quotes, which is valid but less direct.

🔧 Formula Fix

advanced

Identify error in SWITCH with missing default

What error occurs when running this DAX measure?

Measure = SWITCH([Score], 1, "Low", 2, "Medium", 3, "High")

Assume [Score] can be 4.

Power BI

Measure = SWITCH([Score], 1, "Low", 2, "Medium", 3, "High")

A Returns blank for [Score] = 4

B Returns "High" for [Score] = 4

C Syntax error due to missing default value

D Runtime error due to unmatched value

💡 Hint

SWITCH returns blank if no match and no default is provided.

When no match is found and no default value is specified, SWITCH returns blank (empty) instead of an error.

❓ visualization

advanced

Best visualization for SWITCH-based category measure

You created a measure using SWITCH to categorize customers into "New", "Active", and "Churned" based on purchase dates.

Which visualization best shows the count of customers per category clearly and accessibly?

A Stacked bar chart with categories stacked vertically

B Pie chart with distinct colors and labels for each category

C Line chart showing categories over time

D Scatter plot with categories as point colors

💡 Hint

Think about showing parts of a whole clearly with labels.

A pie chart clearly shows proportions of categories with distinct colors and labels, making it easy to understand customer distribution.

🧠 Conceptual

expert

SWITCH vs Nested IF performance and readability

Which statement best explains the advantage of using SWITCH over nested IF statements in DAX for multiple conditions?

A SWITCH improves readability and can be more efficient because it evaluates the expression once and matches values, unlike nested IF which evaluates each condition separately.

B Nested IF is always faster because it stops evaluating as soon as a condition is true, while SWITCH evaluates all conditions.

C SWITCH and nested IF have identical performance and readability in all cases.

D SWITCH can only handle numeric comparisons, so nested IF is preferred for text.

💡 Hint

Consider how many times the expression is evaluated in SWITCH vs IF.

SWITCH evaluates the expression once and compares it to multiple values, improving readability and often performance. Nested IF evaluates each condition separately, which can be less efficient and harder to read.