FROM phrases_ids WHERE id IN (select answer_id from question_answer where question_id = b.id) OR id IN (select question_id from question_answer where answer_id = b.id)
из phrases_ids по условию что id в (выбрать answer_id из question_answer при условии что question_id = b.id) или id в (выбрать question_id из question_answer при условии что question_id = b.id)
FROM phrases_ids AS phrases WHERE id IN (select answer_id from question_answer where question_id = b.id) OR id IN (select question_id from question_answer where answer_id = b.id)