带有嵌套查询的滑动窗口

Question

我陷入了SQL查询中，请问您能帮我吗？也许我不明白这个问题的意思：

Bigquery SQL for sliding window aggregate

我想获取登录用户的数量（每天-DAU），并紧跟属于“重度用户”细分并且过去30天一直在该细分中的用户数量。

>

我已经到了：

  SELECT
  event_date,
  count(distinct(a.user_pseudo_id)) as dau,
      (SELECT count(distinct(user_pseudo_id))
        FROM `api-project-XXXXX.XXXXX.framework_mobile_analytics` b
        WHERE DATE(TIMESTAMP(b.event_date)) BETWEEN 
        DATE_ADD(DATE(TIMESTAMP(a.event_date)) , INTERVAL -30 DAY) AND
        DATE_ADD(DATE(TIMESTAMP(a.event_date)), INTERVAL -1 DAY)
        AND key like "Heavy users%") as heavy_users
    FROM
      `api-project-XXXXX.XXXXX.events_2019*` a
    WHERE
      a.event_name = "login"
    group by 1
    order by 1

但是它给了我这个错误：

LEFT OUTER JOIN cannot be used without a condition that is an equality of fields from both sides of the join.

我不太了解，您能帮助您理解查询还是建议我另一种获取理想表的方法？

所以我理想的输出表如下：

event_date      dau         heavy_users
20190931        124000      75000          (count of heavy users between 20190901 - 20190930)
20191001        111000      95000          (count of heavy users between 20190902 - 20190931)
20191002        122000      85000          (count of heavy users between 20190903 - 20191001)
20191003        154000      84000          (count of heavy users between 20190904 - 20191002)

谢谢！