Thanks, it works ! :)
However if I change
Select [Name], Sum(Hours) As SumHours, [Wages per hour] From YourTable Group By [Name], [Wages per hour];
to
Select [Name], Sum(Hours) As SumHours, [Wages per hour] From YourTable
or to
Select [Name], Sum(Hours) As SumHours, [Wages per hour] From...