The document compares three types of connections in Power BI: Import Query, Direct Query, and Live Query. Import Query imports data into Power BI where it can be transformed, Direct Query retrieves data from its source as needed without importing, and Live Query connects to SSAS in the Power BI service for real-time queries. The document also notes where the data resides and is transformed for each type of connection and which data sources each type supports.

2. Types of
connection
• Import Query
• Direct Query
• Live Query

3. ComparitionData source list : https://docs.microsoft.com/en-us/power-bi/connect-data/power-bi-data-sources
Topic Import Query Direct Query Live Query
Where does Data resides? Data gets imported in
Power BI and resides
there
Data as an when required
is retrieved from the data
source
Data as an when
required is retrieved from
the data source
Data Transformation Full control on data and
can perform all the data
transformation steps
available in Power BI
Desktop
Transformation steps
should be done outside
Power BI
Transformation
steps should be done
outside Power BI
When to use? When data size is small When we have big data
size
When we connect to SSAS
the connect is termed as
live query
Data Source Support All the data source
mention in the Get data
section are supported
Few data sources are
supported. For Ex : SQL
Server
SSAS, power bi dataset in
Power BI service,
Common Data Services