我正在努力为我的问答网站获取最佳查询。作为一个简化示例，我有3个表(问题、答案和用户):table_usersUserIDFirstName1John2Jack3Ana4Mary表格问题QuestionIDfkUserIDTitle14Whatis...?22Whereis...?31Howto...?43Howmuch...?table_answersAnswerIDfkQuestionIDfkUserIDAnswer113Itis...221ItislocatedinZZ...324ItislocatedinYY...432Youhaveto...我正在创建一个新闻源:显示按添加日