Finding date intersections

[Joe Van Dyk <joe@xxxxxxxxx>]

I have a table of sales that have possibly overlapping time ranges. I want to find all the timeranges where there's an active sale. How would you do that?

create table sales (
  times tstzrange
);

insert into sales values
  (tstzrange('2014-1-1', '2014-1-2')),
  (tstzrange('2014-1-2', '2014-1-3')),
  (tstzrange('2014-1-2', '2014-1-4')),
  (tstzrange('2014-1-5', '2014-1-6'));

-- want back:
--   tstzrange('2014-1-1', '2014-1-4')
--   tstzrange('2014-1-6', '2014-1-6')

Thanks,

Joe