Jeff Ross <jr...@wykids.org> writes:
> To get the output I want above, I'd think I'd need to do a left outer join
> like this:
> jr...@wykids localhost# select ed_cat_name as "Level", pp_ed_cat_subject as
> "Subject", pp_ed_cat_institution as "Institution" from
> education_categories left outer join people_education_categories on
> (ed_cat_id = pp_ed_cat_id) where pp_ed_cat_pp_id = 1796;
This query is actually equivalent to a plain join. The reason is that
no null-extended row can possibly satisfy the WHERE clause, since the
WHERE is constraining a field from the inner side of the join. Remember
WHERE filters the output of the join.
Possibly what you want is
select ... from
education_categories left outer join people_education_categories on
(ed_cat_id = pp_ed_cat_id and pp_ed_cat_pp_id = 1796);
regards, tom lane
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