访问记录visit表中包含日期date,用户user_id,访问的页面url 3个字段，以下哪个选项不能计算'2019-03-11'这一天访问过页面的所有用户数
SELECT count(user_id) FROM (SELECT user_id FROM visit WHERE date = '2019-03-11' GROUP BY user_id) f
SELECT count(user_id) FROM (SELECT DISTINCT user_id FROM visit WHERE date = '2019-03-11') f
SELECT count(DISTINCT user_id) FROM visit WHERE date = '2019-03-11'
SELECT count(user_id) FROM visit WHERE date = '2019-03-11' GROUP BY date
