Could not query:SELECT t0.id as t0_id, t0.parent_id as t0_parent_id, t0.alias as t0_alias, t0.type as t0_type, t0.title as t0_title, t1.id as t1_id, t1.parent_id as t1_parent_id, t1.alias as t1_alias, t1.type as t1_type, t1.title as t1_title FROM (SELECT id, parent_id, alias, title, type FROM pages WHERE alias = 'gallery' AND lang = 1 AND status = 1) as t0 JOIN (SELECT id, parent_id, alias, title, type FROM pages WHERE alias = 'Սանկտ_պետերբուրգի-միջազգային-տնտեսական-ֆորում-18-20-հունիսի_-2015' AND lang = 1 AND status = 1) as t1 ON (t1.parent_id = t0.id)