GroupBy Parameter (Select-Access Cmdlet)
A comma-separated list of columns that the result set will be grouped by.
Syntax
Select-Access -GroupBy string
Remarks
The comma-separated list of columns to aggregate the values of and execute a summary function over. Specify the summary function in the Columns parameter with the same syntax you would use for an SQL statement. For example:
Select-Access -Connection $conn -Table Orders -Columns @("ShipCity","SUM(Freight)") -GroupBy "ShipCity" -Where "ShipCountry = 'USA'"