select * from comment where comment_id = #{comment_id} select * from comment select comment.* from comment,user where comment.user_id = user.user_id and user.user_name = #{user_name} select * from comment where movie_id = #{movie_id} insert into comment(comment_content,comment_time,movie_id,user_id) values(#{comment_content},#{comment_time},#{movie_id},#{user_id}) update comment comment_content = #{comment_content}, comment_time = #{comment_time}, movie_id = #{movie_id}, user_id = #{user_id} where comment_id = #{comment_id} delete from comment where comment_id = #{comment_id}