CQRS Query handler with no parameter

public interface IQueryHandler<in TQuery, out TResult>
    where TQuery : IQuery<TResult>
{
    TResult Handle(TQuery query);
}

This is a query handler interface that requires a parameter to execute query.

public class PlaceByIdHandler : IQueryHandler<PlaceById, PlaceModel>
{
    ...........

    public PlaceModel Execute(PlaceById query)
    {
        return repository.Query<PlaceModel>("select * from places where id="+ query.id);
    }
}

But some queryies does not need parameter. For example Get all places:

public class PlaceAllHandler : IQueryHandler<PlaceAll, PlaceModel>
{
    ..........

    public PlaceModel Execute(PlaceAll query)
    {
        return return repository.Query<PlaceModel>("select * from places");
    }
}

But now PlaceAll is a class that has no Member.

public class PlaceAll{}

Is this a true approach? Is there any order?