要分两部分:
正确答案部分,select加where实现,例:select answer_value from t_answer where qestion_id = 1 and is_right = 1
随即答案部分,select加where加order by newid()实现,例:select top 3 answer_value from t_answer where answer_value not in (select answer_value from t_answer where qestion_id = 1 and is_right = 1) order by newid()