Hierarchical Query Question (PHP)
| От | David Blomstrom |
|---|---|
| Тема | Hierarchical Query Question (PHP) |
| Дата | |
| Msg-id | CAA54Z0j1XP0t-RRZiBp=_p+tZEosrFwfix+84kKj_0_SxKi+Sg@mail.gmail.com обсуждение исходный текст |
| Ответы |
Re: Hierarchical Query Question (PHP)
Re: Hierarchical Query Question (PHP) |
| Список | pgsql-general |
Can anyone tell me how to write the query described @ http://stackoverflow.com/questions/33402831/count-descendants-in-hierarchical-query ?
The answer's very thorough, but I don't know how to string two queries and a function together like that. This doesn't work:
$sql = "select * from gz_life_mammals;";
create function tax_rank(id integer) returns text as $$
select case id
when 1 then 'Classes'
when 2 then 'Orders'
when 3 then 'Families'
when 4 then 'Genera'
when 5 then 'Species'
end;
$$ language sql;
$sql = "with recursive hier(taxon,parent_id) as (
select m.taxon, null::integer
from gz_life_mammals m
where taxon='Mammalia' --<< substitute me
union all
select m.taxon, m.parent_id
from hier, gz_life_mammals m
where m.parent=hier.taxon
)
select tax_rank(parent_id),
count(*) num_of_desc
from hier
where parent_id is not null
group by parent_id
order by parent_id;";
Thanks.
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