Cannot use SecondaryNameNode in an HA cluster. The Standby Namenode will perform checkpointingha模式下standby 节点会做check point新的改变功能快捷键合理的创建标题，有助于目录的生成如何改变文本的样式插入链接与图片如何插入一段漂亮的代码片生成一个适合你的列表创建一个表格设定内容居中、居左

1.构建临时表 id， 登录日期，注册日期2.求登录日期-注册日期大于7with t1(select id,login_date, b.resgister_date,date_diff(login,resgister_date) as rkfrom (select distinct id, login_Date from a1) aleft join (select id,min(date) as

1.筛选出七天内数据,groupby id,date2.rank() over() as rk 根据id排序id，date3.date -rk 为同一个数，select date -rk .group by id date-rk having count(*)4.group id具体代码：select t4.idfrom(select id, date_add(t2.dt-t2.rk) as rk