SELECT id question_id, title, qtpye type, diff difficulty , (SELECT pic_url from test_question_pic WHERE question_id = questions.id) pic_url from questions WHERE id IN (SELECT question_id from mxjb_question_collection WHERE user_id = #{userId}) select question_id, user_id, create_time from mxjb_question_collection and question_id = #{questionId} and user_id = #{userId} and create_time = #{createTime} select distinct s.subjectName,s.subjectId from mxjb_question_collection c left join questions q on c.question_id = q.id left join subject s on q.subjectId = s.subjectId where s.subjectName is not null and c.user_id = #{userId} order by s.subjectId asc select distinct q.qtpye as subjectName from mxjb_question_collection c left join questions q on c.question_id = q.id left join subject s on q.subjectId = s.subjectId where c.user_id = #{userId} and q.qtpye is not null and q.subjectId = #{subjectId} where question_id = #{questionId} insert into mxjb_question_collection question_id, user_id, create_time, #{questionId}, #{userId}, #{createTime}, update mxjb_question_collection user_id = #{userId}, create_time = #{createTime}, where question_id = #{questionId} delete from mxjb_question_collection where question_id = #{questionId} and user_id = #{userId} delete from mxjb_question_collection where question_id in #{questionId}