我正在尝试构建一个应用程序,我需要在其中构建类似
的ParseQuerySELECT * FROM PHOTOS WHERE objectID NOT in (SELECT photo FROM HISTORY WHERE user = {currentUser})
考虑班级:
PHOTOS:
*objectID
*photo(file)
*user(user object)
HISTORY
*objectID
*photo(PHOTOS pointer)
*user(user object)
基本上我需要从PHOTOS表中获取照片(文件)不在HISTORY表中。如何为此构建查询。?