DELETE FROM wp_terms WHERE term_id IN (SELECT term_id FROM wp_term_taxonomy WHERE taxonomy = ‚post_tag‘ AND COUNT <= 1); DELETE FROM wp_term_relationships WHERE term_taxonomy_id IN (SELECT term_taxonomy_id FROM wp_term_taxonomy WHERE taxonomy = 'post_tag' AND COUNT <= 1); DELETE FROM wp_term_taxonomy WHERE taxonomy = 'post_tag' AND COUNT <= 1