sql - How to select several columns in Postgres without group by all columns -


i'm using postgres 8.4.2 , i'm trying make query selects data wrong results when group these several columns select.

i tried not group of these columns, notice, should group selected columns.

my query looks that:

 select c.id category_id, c.parent_id, c.title category_title, count(ofrs.id) offers_count    categories c    left join offers_to_categories otc on c.id = otc.category_id    left join offers ofrs on otc.offer_id = ofrs.id   ofrs.offer_type = 1 , ofrs.status = 1   group c.id, c.title, c.parent_id;

i want select offers count category offer_type = 1.

how without group several columns group c.id?

i tried following window function result same - shows me more results should be.

select  ofr.id , c.id category_id, c.parent_id, c.title category_title,ofr.website_id ,  count( ofr.id)   on (partition  (ofr.id) order ofr.id)  offers ofr  inner join offers_to_categories ofr_cat on (ofr_cat.offer_id = ofr.id)  inner join categories c on (c.id = ofr_cat.category_id)  (c.id = 3 or c.parent_id = 3) , ofr.website_id = 1 , ofr.status = 1

i found answer question , is:

select  distinct on(ofr.id) ofr.id , c.id category_id, c.parent_id, c.title category_title,ofr.website_id , count( ofr.id)   on (partition  (select distinct on(ofr.id) ofr.id offers id group ofr.id) order ofr.id) offers ofr inner join offers_to_categories ofr_cat on (ofr_cat.offer_id = ofr.id) inner join categories c on (c.id = ofr_cat.category_id) (c.id = 3 or c.parent_id = 3) , ofr.website_id = 1 , ofr.status = 1

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