2013-03-27 176 views
0

用户,活动和群组都可以是tagged in a photo。在photo_tag的可用字段中,无法区分哪些主题ID是用户,事件或组。我只想返回在照片中标记的朋友列表,忽略不是我的朋友的事件,组和用户。获取我在照片中标记的朋友列表

有谁知道为什么这会返回0结果?

SELECT subject, xcoord, ycoord, text 
FROM photo_tag 
WHERE object_id = [PHOTO_OBJECT_ID] 
AND subject IN (SELECT uid2 FROM friend WHERE uid1 = me()) 

即使...

SELECT subject, xcoord, ycoord, text 
FROM photo_tag 
WHERE object_id = [PHOTO_OBJECT_ID] 

返回...

SELECT uid2 FROM friend where uid1 = me() and uid2 = [SUBJECT_USER_ID] 

回答