"Domingo Alvarez Duarte" <mingodad@gmail.com> writes:
> It seems that postgresql is issuing a kind of trim on the column value
> before sort/compare, because it's ignoring spaces and '-' wich I use
> propositally to move some values to front.
> Why postgresql is behaving this way ?
Because the LC_COLLATE setting is telling it to. If you try sorting
the same data with sort(1) I'll bet you get the same result. This
is standard behavior for quite a lot of locale settings.
If you don't like the result then you need to switch to a different
locale setting, probably "C". Unfortunately, that requires dump,
re-initdb with the correct locale option, reload :-(
regards, tom lane
