链表查询，
并且记录答案出现的次数；
SELECT uqsub.title AS '题目', uqa.content as '答题内容', uqo.name as'题目选项', uqa.answerid as '序号', uqa.createTime as '时间', count(uqa.createTime) as '次数' FROM uwin_question_sheet uqs, uwin_question_answer uqa, uwin_question_subject uqsub, uwin_question_option uqo WHERE uqsub.subjectid = uqa.subjectid and uqo.subjectid = uqa.subjectid and uqo.sort = uqa.optionid group by uqo.name order by uqa.subjectid
