对于通过不同渠道拉新进来的用户，经过一段时间许多用户可能流水，而留下来的用户称之为留存用户。分析用户留存是拉新和用户运营的重要指标。假如我们有一张用户访问表：person_visit，记录了所有用户的访问信息，包含字段：用户id：user_id，访问时间：visit_date，访问页面：page_name，访问渠道（android,ios）：plat等请统计每个访问渠道7天前（D-7）的...

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云数据库 RDS SQL Server 版

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