Two Columns Unique when joined together within SharePoint
I am new to PowerApps development so I apologise if may request for help is obvious.
I have a SharePoint list where a project id is made up of two SharePoint columns.
Red UK Red-UK
Blue USA Blue-USA
Green Australia Green-Australia
Red Canada Red-Canada
Yellow USA Yellow-USA
My PowerApps has the two columns Column01 and Column02.
My question is how do I setup my PowerApps so when a user types in the two PowerApps text boxs for columns01 and column02 a check is done to make sure the text is unique when the two columns are joined together to create the Project ID within the SharePoint list?
Because I am new to PowerApps can you please go into detail or use screenshots.