Composite models in Power BI - Step-by-Step Guide

Introduction

Composite models let you combine data from different sources in one Power BI report. This helps you analyze data together without moving or copying it all into one place.

When you want to combine data from a cloud source and a local file in one report.

When your sales data is in a database but customer info is in an Excel file and you want to analyze both.

When you need to add a small table to a big dataset without importing the whole big dataset.

When you want to use DirectQuery for live data and import mode for static data in the same report.

When you want to improve report performance by mixing import and DirectQuery data.

Steps

Step 1: Open Power BI Desktop

- Start screen

Power BI Desktop opens with a blank report

Step 2: Click Get data

- Home tab

Get Data window appears showing data source options

Step 3: Select a data source that supports DirectQuery (e.g., SQL Server) and connect

- Get Data window

Data loads in DirectQuery mode and appears in Fields pane

Step 4: Click Get data again

- Home tab

Get Data window appears again

Step 5: Select another data source (e.g., Excel file) and import data

- Get Data window

Imported data appears in Fields pane alongside DirectQuery data

Step 6: Create relationships between tables from different sources

- Model view

Tables from different sources connect and can be used together in visuals

Step 7: Build visuals using fields from both DirectQuery and imported tables

- Report view

Visuals show combined data from multiple sources

Before vs After

Before

Report has only one data source, either imported or DirectQuery, limiting combined analysis

After

Report has multiple data sources combined, allowing analysis across imported and live data

Settings Reference

Storage mode

📍 Model view > Table properties

Choose how data is stored and accessed for each table

Default: Import

Enable composite models

📍 Options > Preview features

Turn on support for composite models in Power BI Desktop

Default: Disabled

Relationships active/inactive

📍 Model view > Relationship line

Control which relationships are used in calculations

Default: Active

Common Mistakes

Trying to create relationships between tables without enabling composite models

Power BI blocks relationships between DirectQuery and imported tables if composite models are off

Enable composite models in Preview features before combining data sources

Using too many DirectQuery tables causing slow report performance

DirectQuery queries live data each time, which can slow down visuals

Use import mode for static or small tables and DirectQuery only for large or frequently updated data

Summary

Composite models let you mix imported and live data in one Power BI report.

You can create relationships between tables from different sources for combined analysis.

Remember to enable composite models in settings and choose storage modes wisely for best performance.

Practice

1.

What is the main benefit of using composite models in Power BI?

easy

A. They only work with Import mode data.

B. They allow combining data from multiple sources in one report.

C. They automatically clean data without user input.

D. They replace the need for relationships between tables.

Solution

1. Step 1: Understand composite models purpose

   Composite models let you combine data from different sources in one Power BI report.

2. Step 2: Compare options

   Only 'They allow combining data from multiple sources in one report.' correctly states this benefit; others are incorrect or unrelated.

3. Final Answer:

   They allow combining data from multiple sources in one report. -> Option B

4. Quick Check:

   Composite models = combine multiple sources [OK]

Hint: Composite models = mix data sources in one report [OK]

Common Mistakes:

• Thinking composite models only work with Import mode
• Believing composite models clean data automatically
• Assuming relationships are not needed in composite models

2.

Which of the following is the correct way to enable composite models in Power BI?

Options > Preview Features > Enable Composite Models

easy

A. Enable Composite Models under Options > Preview Features

B. Enable Composite Models under File > Export

C. Enable Composite Models under Home > Transform Data

D. Enable Composite Models under View > Themes

Solution

1. Step 1: Locate composite models setting

   Composite models are enabled via Options > Preview Features in Power BI Desktop.

2. Step 2: Verify other options

   Other options do not contain this setting, so only Enable Composite Models under Options > Preview Features is correct.

3. Final Answer:

   Enable Composite Models under Options > Preview Features -> Option A

4. Quick Check:

   Composite models setting = Options > Preview Features [OK]

Hint: Check Preview Features in Options for composite models [OK]

Common Mistakes:

• Looking for composite models in Export or Themes menus
• Confusing data transformation with enabling composite models
• Assuming composite models are enabled by default

3.

Given a composite model with two tables: Sales (Import mode) and Customers (DirectQuery mode), what happens when you create a relationship between them?

medium

A. The relationship only works if both tables are in Import mode.

B. Power BI throws an error because relationships cannot connect Import and DirectQuery tables.

C. The relationship works but disables DirectQuery mode for the Customers table.

D. Power BI allows cross-source relationships, enabling combined filtering and analysis.

Solution

1. Step 1: Understand composite model relationships

   Composite models allow relationships between Import and DirectQuery tables.

2. Step 2: Analyze options

   Only 'Power BI allows cross-source relationships, enabling combined filtering and analysis.' correctly states what happens; others are false.

3. Final Answer:

   Power BI allows cross-source relationships, enabling combined filtering and analysis. -> Option D

4. Quick Check:

   Composite models = cross-source relationships allowed [OK]

Hint: Composite models support relationships across Import and DirectQuery [OK]

Common Mistakes:

• Believing relationships cannot connect different storage modes
• Thinking DirectQuery tables lose their mode when related
• Assuming relationships only work within same storage mode

4.

You created a composite model with Import and DirectQuery tables but get an error when trying to build a relationship. What is a likely cause?

medium

A. The composite models feature is not enabled in Preview Features.

B. You used the wrong DAX syntax for the relationship.

C. Power BI does not support relationships between tables.

D. The data sources are from the same database.

Solution

1. Step 1: Check composite models feature status

   If composite models are not enabled in Preview Features, relationships between Import and DirectQuery tables cause errors.

2. Step 2: Evaluate other options

   DAX syntax is not used to create relationships; Power BI supports relationships; same database does not cause errors.

3. Final Answer:

   The composite models feature is not enabled in Preview Features. -> Option A

4. Quick Check:

   Enable composite models to allow cross-source relationships [OK]

Hint: Enable composite models in Preview Features to avoid relationship errors [OK]

Common Mistakes:

• Trying to fix relationships with DAX syntax
• Assuming relationships are unsupported in Power BI
• Thinking same database causes relationship errors

5.

You have a composite model with three tables: Orders (Import), Products (DirectQuery), and Customers (Import). You want to create a report showing total sales by product category and customer region. Which approach is best?

hard

A. Use only the Orders table and ignore others to simplify the report.

B. Import all tables to avoid composite models and relationships.

C. Create relationships between all tables, use DirectQuery for Products, and build visuals combining all data.

D. Create separate reports for each table and combine them outside Power BI.

Solution

1. Step 1: Understand composite model usage

   Composite models allow mixing Import and DirectQuery tables with relationships for combined analysis.

2. Step 2: Apply to scenario

   Creating relationships between all tables and using DirectQuery for Products enables combined sales by product category and customer region.

3. Step 3: Evaluate other options

   Importing all tables may not be possible; ignoring tables loses insights; separate reports reduce integration.

4. Final Answer:

   Create relationships between all tables, use DirectQuery for Products, and build visuals combining all data. -> Option C

5. Quick Check:

   Composite models + relationships = combined report [OK]

Hint: Use relationships to combine Import and DirectQuery tables in one report [OK]

Common Mistakes:

• Trying to avoid composite models by importing all data
• Ignoring important tables for simplicity
• Splitting data into separate reports unnecessarily