delete from channel_users where channel_id = #{channelId} INSERT INTO channel_users (channel_id, uid) VALUES (#{channelId}, #{value}) select uid from channel_users where channel_id = #{channelId} select u.uid,u.erban_no as erbanNo,u.nick,u.avatar from channel_users cu left join users u on cu.uid = u.uid where channel_id = #{channelId} delete from channel_users WHERE channel_id = #{channelId} AND uid = #{uid}