如何提取所有在2020年1月的前两个会话中产生的收入超过500美元的visitor_id的列表？

表格：

1. 届会
2. session_ts
3. visitor_id
4. 垂直
5. session_id
6. 交易次数
7. session_ts
8. session_id
9. rev_bucket
10. 收入

当前具有以下查询（使用SQLite）：

SELECT
  s.visitor_id,
  sub.session_id,
  month,
  year,
  total_rev,
  CASE 
    WHEN (row_num IN (1,2) >= total_rev >= 500) THEN 'Yes'
    ELSE 'No' END AS High_Value_Transactions,
  sub.row_num
FROM
  sessions s
JOIN
  (
    SELECT
    s.visitor_id,
    t.session_id,
    strftime('%m',t.session_ts) as month,
    strftime('%Y',t.session_ts) as year,
    SUM(t.revenue) as total_rev,
    row_number() OVER(PARTITION BY s.visitor_id ORDER BY s.session_ts) as row_num
  FROM
    Transactions t
  JOIN
    sessions s
  ON
    s.session_id = t.session_id
  WHERE strftime('%m',t.session_ts) = '01'
  AND strftime('%Y',t.session_ts) = '2020'
  GROUP BY 1,2
) sub
ON
  s.session_id = sub.session_id
WHERE sub.row_num IN (1,2)
ORDER BY 1

我在确定前两个会话的总费用为500美元时遇到了麻烦。 公开接受任何反馈并简化查询。谢谢！