SWITCH function in Power BI - Dashboard Guide

Dashboard Mode - SWITCH function

Dashboard Goal

Understand how sales performance varies by product category and show a clear label for each category using the SWITCH function.

Sample Data

Order ID	Product Category	Sales Amount
1001	Electronics	250
1002	Clothing	150
1003	Electronics	300
1004	Furniture	450
1005	Clothing	200
1006	Furniture	350
1007	Electronics	400

Dashboard Components

• KPI Card: Total Sales
  Formula: Total Sales = SUM('Sales'[Sales Amount])
  Result: 2100
• Calculated Column: Category Label
  Formula:
  Category Label = SWITCH('Sales'[Product Category], "Electronics", "Tech Gear", "Clothing", "Apparel", "Furniture", "Home Goods", "Other")
  This replaces category names with friendly labels.
• Bar Chart: Sales by Category Label
  Shows total sales grouped by the new Category Label.
• Table: Sales Details
  Shows Order ID, Product Category, Sales Amount, and Category Label columns.

Dashboard Layout

+----------------------+----------------------+
|      Total Sales      |  Sales by Category   |
|       (KPI Card)      |      (Bar Chart)     |
+----------------------+----------------------+
|                Sales Details Table               |
+-------------------------------------------------+

Interactivity

A slicer on Product Category lets you filter all components. Selecting a category updates the KPI card, bar chart, and table to show only that category's data.

Self Check

If you add a filter for Product Category = Electronics, which components update and what will the Total Sales show?

• All components update to show only Electronics data.
• Total Sales will show 950 (250 + 300 + 400).

Key Result

Dashboard shows total sales and sales by friendly category labels using SWITCH function.

Practice

1. What does the SWITCH function do in Power BI?

easy

A. It filters rows based on a condition.

B. It creates a new table from existing data.

C. It chooses a result based on matching values or conditions.

D. It sums values in a column.

Solution

1. Step 1: Understand the purpose of SWITCH

   The SWITCH function evaluates an expression and returns a result based on matching values or conditions.

2. Step 2: Compare with other functions

   Unlike filtering or summing, SWITCH simplifies multiple IF conditions into one formula.

3. Final Answer:

   It chooses a result based on matching values or conditions. -> Option C

4. Quick Check:

   SWITCH picks result by matching values [OK]

Hint: Remember: SWITCH picks output based on matching input [OK]

Common Mistakes:

• Confusing SWITCH with filtering functions
• Thinking SWITCH creates tables
• Assuming SWITCH sums values

2. Which of the following is the correct syntax for a basic SWITCH function in DAX?

easy

A. SWITCH(<expression>, <value1>, <value2>, <result1>, <result2>, <else_result>)

B. SWITCH(<value1>, <result1>, <value2>, <result2>, <else_result>)

C. SWITCH(<expression>, <result1>, <value1>, <result2>, <value2>, <else_result>)

D. SWITCH(<expression>, <value1>, <result1>, <value2>, <result2>, <else_result>)

Solution

1. Step 1: Recall SWITCH syntax

   The correct syntax is SWITCH(expression, value1, result1, value2, result2, else_result).

2. Step 2: Check option correctness

   SWITCH(<expression>, <value1>, <result1>, <value2>, <result2>, <else_result>) matches the correct order: expression first, then pairs of value and result, ending with else result.

3. Final Answer:

   SWITCH(<expression>, <value1>, <result1>, <value2>, <result2>, <else_result>) -> Option D

4. Quick Check:

   Correct SWITCH syntax = SWITCH(<expression>, <value1>, <result1>, <value2>, <result2>, <else_result>) [OK]

Hint: Expression first, then value-result pairs, else last [OK]

Common Mistakes:

• Omitting the expression argument
• Swapping values and results
• Placing else_result in the middle

3. Given the DAX measure:

Category Result = SWITCH(
  'Sales'[Category],
  "A", "High",
  "B", "Medium",
  "C", "Low",
  "Unknown"
)

What is the result when 'Sales'[Category] is "B"?

medium

A. "High"

B. "Medium"

C. "Low"

D. "Unknown"

Solution

1. Step 1: Identify the input value

   The input value is 'Sales'[Category] = "B".

2. Step 2: Match input with SWITCH cases

   SWITCH checks "A" -> "High", "B" -> "Medium", "C" -> "Low". Since input is "B", result is "Medium".

3. Final Answer:

   "Medium" -> Option B

4. Quick Check:

   Category "B" returns "Medium" [OK]

Hint: Match input value to cases in order [OK]

Common Mistakes:

• Choosing the first result always
• Confusing value and result pairs
• Ignoring the else result

4. Identify the error in this DAX formula:

Result = SWITCH(
  TRUE(),
  Sales[Amount] > 1000, "High",
  Sales[Amount] > 500, "Medium",
  Sales[Amount] > 100, "Low"
)

medium

A. Missing ELSE result for unmatched conditions.

B. Incorrect use of TRUE() in SWITCH.

C. Conditions should be separated by commas, not line breaks.

D. Sales[Amount] cannot be compared with numbers.

Solution

1. Step 1: Analyze SWITCH with TRUE()

   Using TRUE() allows SWITCH to evaluate conditions in order.

2. Step 2: Check for ELSE result

   No ELSE (default) result is provided, so if none match, result is blank or error.

3. Final Answer:

   Missing ELSE result for unmatched conditions. -> Option A

4. Quick Check:

   Always add ELSE result in SWITCH with TRUE() [OK]

Hint: Add ELSE result to cover all cases [OK]

Common Mistakes:

• Forgetting ELSE result causes blanks
• Thinking TRUE() is invalid in SWITCH
• Misunderstanding condition order

5. You want to create a measure that categorizes sales amount into "Very High" (above 2000), "High" (1001-2000), "Medium" (501-1000), "Low" (1-500), and "No Sales" (0 or less). Which SWITCH formula correctly implements this?

hard

A. SWITCH(TRUE(), Sales[Amount] > 2000, "Very High", Sales[Amount] > 1000, "High", Sales[Amount] > 500, "Medium", Sales[Amount] > 0, "Low", "No Sales")

B. SWITCH(Sales[Amount], >2000, "Very High", >1000, "High", >500, "Medium", >0, "Low", "No Sales")

C. SWITCH(TRUE(), Sales[Amount] >= 2000, "Very High", Sales[Amount] >= 1000, "High", Sales[Amount] >= 500, "Medium", Sales[Amount] >= 1, "Low", "No Sales")

D. SWITCH(TRUE(), Sales[Amount] > 2000, "Very High", Sales[Amount] >= 1000, "High", Sales[Amount] >= 501, "Medium", Sales[Amount] >= 1, "Low", "No Sales")

Solution

1. Step 1: Use SWITCH with TRUE() for condition checks

   Using SWITCH(TRUE(), ...) allows checking conditions in order from highest to lowest.

2. Step 2: Verify condition ranges and order

   SWITCH(TRUE(), Sales[Amount] > 2000, "Very High", Sales[Amount] > 1000, "High", Sales[Amount] > 500, "Medium", Sales[Amount] > 0, "Low", "No Sales") correctly uses > 2000, > 1000, > 500, > 0, then else "No Sales". This covers all ranges without overlap.

3. Step 3: Check other options for errors

   SWITCH(Sales[Amount], >2000, "Very High", >1000, "High", >500, "Medium", >0, "Low", "No Sales") has invalid syntax (cannot use >2000 as value). Options A and D use >= which changes boundaries and may overlap or miss exact ranges.

4. Final Answer:

   SWITCH(TRUE(), Sales[Amount] > 2000, "Very High", Sales[Amount] > 1000, "High", Sales[Amount] > 500, "Medium", Sales[Amount] > 0, "Low", "No Sales") -> Option A

5. Quick Check:

   Use SWITCH(TRUE()) with descending conditions [OK]

Hint: Order conditions from highest to lowest with TRUE() [OK]

Common Mistakes:

• Using invalid syntax for conditions
• Overlapping or missing ranges
• Not using TRUE() for condition checks