-- -- wp_presentation__get_background/1 -- create or replace function wp_presentation__get_background( integer ) returns text as $$ declare pres_item_id alias for $1; begin return content from cr_revisions, cr_items where cr_items.content_type = 'cr_wp_presentation_bak' and cr_items.parent_id = p_pres_item_id and cr_revisions.revision_id = cr_items__live_revision; end;$$ language plpgsql;