I think I had originally written something like select min(size) min, max(size) max, max-min range, but that didn’t work as the newly introduced names ‘weren’t

I think I had originally written something like select min(size) min, max(size) max, max-min range, but that didn’t work as the newly introduced names ‘weren’t in scope’ and I didn’t want to type those aggregations out again. You’re right that it could have been avoided.