drop table if exists b_vote;
drop table if exists b_vote_answer;
drop table if exists b_vote_channel;
drop table if exists b_vote_channel_2_group;
drop table if exists b_vote_channel_2_site;
drop table if exists b_vote_event;
drop table if exists b_vote_event_answer;
drop table if exists b_vote_event_question;
drop table if exists b_vote_question;
drop table if exists b_vote_user;