Thomas Nyberg <tomuxiong(at)gmx(dot)com> writes:
> Here both 'hello' and 'hello world' are ranked equally highly when
> searching with 'hello'. What I'm wondering is, is there a way within
> postgres to have it match higher to just 'hello' than 'hello world'?
> I.e. something like it slightly down-weights extraneous terms? Of course
> in general I don't know the query or the field strings ahead of time.
Read the documentation for ts_rank --- there's a normalization option
for that.
I'd also suggest you might prefer using ts_rank_cd, which is supposed to
penalize cases where the matching words aren't close together.
regards, tom lane