Relationship direction and cross-filtering in Power BI - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to set the relationship direction to single in Power BI.

Power BI

Relationship.Direction = [1]

Drag options to blanks, or click blank then click option'

ADouble

BBoth

CNone

DSingle

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing 'Both' when only one direction is needed.

Using 'Double' which is not a valid option.

In Power BI, the relationship direction can be set to 'Single' or 'Both'. 'Single' means filtering flows in one direction only.

2fill in blank

medium

Complete the DAX expression to calculate total sales filtered by related product category.

Power BI

TotalSales = CALCULATE(SUM(Sales[Amount]), RELATEDTABLE([1]))

Drag options to blanks, or click blank then click option'

ADate

BProduct

CCategory

DCustomer

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'Product' instead of 'Category' which does not filter by category.

Choosing unrelated tables like 'Customer' or 'Date'.

The RELATEDTABLE function filters the Sales table by the related Category table, so 'Category' is the correct table to use.

3fill in blank

hard

Fix the error in the DAX formula to enable cross-filtering from 'Customers' to 'Sales'.

Power BI

CrossFilter = CROSSFILTER(Customers[CustomerID], Sales[CustomerID], [1])

Drag options to blanks, or click blank then click option'

ANone

BBoth

CSingle

DDouble

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'Single' which only filters one way.

Choosing 'Double' which is not a valid option.

The CROSSFILTER function requires 'Both' to enable cross-filtering in both directions between Customers and Sales tables.

4fill in blank

hard

Fill both blanks to create a bidirectional relationship between 'Orders' and 'Products' tables.

Power BI

CREATE RELATIONSHIP Orders[ProductID] TO Products[ProductID] WITH CROSSFILTER [1] AND DIRECTION [2]

Drag options to blanks, or click blank then click option'

ABoth

BSingle

DNone

Attempts:

3 left

💡 Hint

Common Mistakes

Setting cross-filter or direction to 'Single' which limits filtering to one way.

Using 'None' which disables filtering.

To create a bidirectional relationship, both cross-filter and direction must be set to 'Both'.

5fill in blank

hard

Fill all three blanks to write a DAX measure that sums sales filtered by related product category with bidirectional filtering.

Power BI

TotalCategorySales = CALCULATE(SUM(Sales[Amount]), CROSSFILTER(Sales[ProductID], [1][ProductID], [2]), RELATEDTABLE([3]))

Drag options to blanks, or click blank then click option'

AProducts

BBoth

CCategory

DSingle

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'Single' instead of 'Both' for cross-filter direction.

Choosing wrong tables for RELATEDTABLE or CROSSFILTER.

The CROSSFILTER function uses 'Products' table and 'Both' direction for bidirectional filtering. RELATEDTABLE uses 'Category' to filter sales by product category.

Practice

1. What does the Single relationship direction mean in Power BI?

easy

A. Filters flow between tables in both directions.

B. Filters flow randomly between tables.

C. Filters do not flow between tables at all.

D. Filters flow from one table to another in only one direction.

Solution

1. Step 1: Understand relationship direction

   Single direction means filter context flows from one table to another, but not back.

2. Step 2: Compare with both directions

   Both directions allow filters to flow both ways, unlike single direction.

3. Final Answer:

   Filters flow from one table to another in only one direction. -> Option D

4. Quick Check:

   Single direction = one-way filter flow [OK]

Hint: Single direction means filter flows one way only [OK]

Common Mistakes:

• Confusing single with both directions
• Thinking filters flow both ways in single direction
• Assuming no filters flow in single direction

2. Which of the following is the correct DAX syntax using CROSSFILTER to enable Both direction filtering in Power BI?

easy

A. CROSSFILTER(Table1[ID], Table2[ID], Both)

B. CROSSFILTER(Table1[ID], Table2[ID], DIRECTION Both)

C. CROSSFILTER(Table1[ID], Table2[ID], BothDirection)

D. CROSSFILTER(Table1[ID], Table2[ID], BothDirections)

Solution

1. Step 1: Recall correct DAX syntax for relationship direction

   Power BI uses CROSSFILTER keyword with values Single or Both to set filter direction.

2. Step 2: Identify correct option

   CROSSFILTER(Table1[ID], Table2[ID], Both) uses CROSSFILTER Both which is the correct syntax for both directions.

3. Final Answer:

   CROSSFILTER(Table1[ID], Table2[ID], Both) -> Option A

4. Quick Check:

   Relationship direction syntax uses CROSSFILTER Both [OK]

Hint: Use CROSSFILTER Both to set both directions in DAX [OK]

Common Mistakes:

• Using DIRECTION keyword instead of CROSSFILTER
• Misspelling Both as BothDirection or BothDirections
• Confusing syntax with SQL JOIN

3. Given two tables, Customers and Orders, with a single direction relationship from Customers to Orders, what happens when you filter Orders by a specific Product?

medium

A. The Customers table is filtered to show only customers who ordered that product.

B. The Orders table is filtered, but Customers table remains unfiltered.

C. Both Customers and Orders tables are filtered by the product.

D. No filtering happens on either table.

Solution

1. Step 1: Understand filter flow in single direction relationship

   Filter flows from Customers to Orders, but not from Orders back to Customers.

2. Step 2: Apply filter on Orders table

   Filtering Orders by product affects Orders only; Customers table remains unfiltered.

3. Final Answer:

   The Orders table is filtered, but Customers table remains unfiltered. -> Option B

4. Quick Check:

   Single direction filters one way only [OK]

Hint: Filter flows only from one side in single direction [OK]

Common Mistakes:

• Assuming filter flows both ways
• Thinking Customers table filters Orders only
• Confusing filter direction with cross-filtering

4. You created a relationship between Sales and Products tables with Both directions, but filtering Products does not filter Sales. What is the likely issue?

medium

A. The relationship is inactive and needs to be activated.

B. The relationship direction is set to Single, not Both.

C. The tables have no matching keys for the relationship.

D. Cross-filtering is disabled in report settings.

Solution

1. Step 1: Check relationship activation status

   Inactive relationships do not apply filters even if direction is Both.

2. Step 2: Confirm relationship direction and keys

   Direction Both is set, and keys exist, so inactive status is the issue.

3. Final Answer:

   The relationship is inactive and needs to be activated. -> Option A

4. Quick Check:

   Inactive relationship blocks filter flow [OK]

Hint: Activate relationships to enable filter flow [OK]

Common Mistakes:

• Assuming direction is wrong without checking activation
• Ignoring inactive relationships
• Thinking cross-filtering is a global setting

5. You have three tables: Customers, Orders, and Products. Customers to Orders has a single direction relationship (Customers filters Orders). Orders to Products has a single direction relationship (Products filters Orders). You want to create a report where filtering Customers also filters Products. What is the best approach?

hard

A. Change both relationships to Both directions to enable filter flow from Customers to Products.

B. Create a direct relationship from Customers to Products with Both directions.

C. Use DAX measures with CROSSFILTER to simulate filter flow from Customers to Products.

D. Keep relationships as is; filtering Customers will automatically filter Products.

Solution

1. Step 1: Analyze existing relationships and filter flow

   Customers filters Orders, Products filters Orders, but no direct filter flow from Customers to Products.

2. Step 2: Understand why filtering Customers does not filter Products

   Because Orders to Products filters from Products to Orders, filter does not flow from Orders to Products.

3. Step 3: Use DAX with CROSSFILTER to simulate filter flow

   Using CROSSFILTER in measures can override filter direction temporarily to enable filtering Products by Customers.

4. Final Answer:

   Use DAX measures with CROSSFILTER to simulate filter flow from Customers to Products. -> Option C

5. Quick Check:

   Use CROSSFILTER in DAX for complex filter flow [OK]

Hint: Use CROSSFILTER in DAX to override filter direction [OK]

Common Mistakes:

• Changing all relationships to Both can cause ambiguity
• Creating unnecessary direct relationships
• Assuming filter flows automatically through multiple single directions