Select arbitrary single value for GROUP BY: What’s the fastest option?

I have a query that I use to indicate locations in a map where there are overlapping points:

select     min(objectid) as min_objectid,     longitudex,     latitudey,     count(1) as count,     min(shape) as min_shape from     workorders group by     longitudex,     latitudey having     count(1) > 1 

In the mapping software that I use, I need to include columns like objectid and shape. For those columns, it doesn’t matter which of the grouped-by rows the values come from, just as long as there is a value.

Presently, I’m using min() to get an arbitrary value for those columns. However, I don’t know if that’s the fastest option since finding the minimum value would require calculation — and I wonder if that time spent is unnecessary.

What is the fastest option for getting an arbitrary/single value for GROUP BY in an Oracle query?