select activityID,activityTitle,
(select isnull(sum(Expected_persons),0) from activities_registration where activityID = a.activityID) as Expected_persons_Count
from activities_info a
这个意思?
(select isnull(sum(Expected_persons),0) from activities_registration where activityID = a.activityID) as Expected_persons_Count
from activities_info a
这个意思?
解决方案 »
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