WordPress database error: [Unknown column 'post_id' in 'field list']
SELECT count(DISTINCT post_id) FROM wp_posts INNER JOIN wp_term_relationships ON (wp_posts.ID = wp_term_relationships.object_id) INNER JOIN wp_term_taxonomy ON (wp_term_relationships.term_taxonomy_id = wp_term_taxonomy.term_taxonomy_id) WHERE 1=1 AND wp_term_taxonomy.taxonomy = 'category' AND wp_term_taxonomy.term_id IN ('8') AND post_type = 'post' AND (post_status = 'publish') ORDER BY post_date DESC