In Power BI, there are several data types that can be used to define columns in a data model, including:

* Whole Number (Integer)
* Decimal Number (Floating Point)
* Currency
* Date/Time
* Text (String)
* Boolean
* Percentage
Each data type has a specific use case and can impact the results of a report. For example :

* Whole Number (Integer) - used for columns with whole numbers such as the number of units sold.

* Decimal Number (Floating Point) - used for columns with decimal values, such as sales amounts.

* Currency - used for columns with currency values, such as sales amounts.

* Date/Time - used for columns with date and time values, such as the date of a sale.

* Text (String) - used for columns with text values, such as names or product descriptions.

* Boolean - used for columns with binary values, such as true/false or yes/no.

* Percentage - used for columns with values represented as a percentage, such as the percentage of sales.

It is important to correctly define the data type for each column in the data model to ensure that the results of a report are accurate and meaningful. For example, if a column with sales amounts is defined as a Whole Number, any fractional values would be rounded or truncated, which could impact the accuracy of the results.