-- 廊坊地区，11月4日到11.15日两次消费间隔的会员，以及两次消费之间的间隔天数
select a.* , datediff(a.第二次消费时间, a.第一次消费时间) 间隔 from 
(select m.card_code , m.realname , m.mobile , 
substring_index(group_concat(o.begin_date order by o.begin_date), ',' , 1) 第一次消费时间 , 
substring_index(group_concat(o.begin_date order by o.begin_date desc), ',' , 1) 第二次消费时间
	from `order` o
		left join member m on o.member_id = m.id
			left join shop s on o.counter_code = s.`code`
				where o.member_id > 0
					and o.begin_date between '2019-11-06 00:00:00' and '2019-11-17 23:59:59'
						and s.city = '廊坊'
							group by o.member_id
								having count(o.member_id) = 2)a