SELECT date1 AS date, CONCAT(ROUND((a/b)*100,1),'%') AS cr FROM( SELECT DATE(order_time) AS date1, COUNT(DISTINCT user_id) AS a FROM order_tb GROUP BY date1) A JOIN ( SELECT DATE(visit_time) AS date2, COUNT(DISTINCT user_id) AS b FROM visit_tb GROUP BY date2) B ON A.date1 = B.date2 要对用户去重,DISTINT us...