What's the canonical way of doing this? Various failed attempts include: select array_length(%%'a=>1'::hstore - 'a=>1'::hstore, 1)
select array_length(%%('a=>1'::hstore - 'a=>1'::hstore), 1) select array_length(avals('a=>1'::hstore - 'a=>1'::hstore), 1); select array_length(akeys('a=>1'::hstore - 'a=>1'::hstore), 1); select skeys('a=>1'::hstore - 'a=>1'::hstore) is null select 'a=>1'::hstore - 'a=>1'::hstore is null Etc. -- Wells Oliver wellsoli...@gmail.com