我在下面的查询中只会提取尚未打开的电子邮件。我希望它能够发送所有发送的电子邮件（在时间范围内）并显示[OpenDate]是否为空。
我正在使用Exact Target（Marketing Cloud）的SQL查询。有什么想法，为什么以下不起作用？
SELECT j.EmailName, s.EmailAddress, j.JobID, j.DeliveredTime, s.SubscriberKey, max(o.EventDate) as OpenDate FROM _Job j
INNER JOIN _Sent se ON j.JobID = se.JobID
INNER JOIN _Subscribers s ON se.SubscriberKey = s.SubscriberKey
LEFT OUTER JOIN _Open o ON se.JobID = o.JobID
WHERE se.EventDate >= GetDate()-14 AND se.EventDate <= GetDate() -7
GROUP BY j.JobID, j.EmailName, j.DeliveredTime, s.EmailAddress, s.SubscriberKey