insert into t_user_channels (user_id, channel_id, device_id, related_user, add_time)
select 123456 as user_id, 'ss' as channel_id, device_id as device_id, '0' as related_user, '2020-11-20 10:55:00' as add_time from t_channels
where id = '71000000001180000008' on conflict(user_id, channel_id, device_id) do update set add_time = '2020-11-20 10:55:00';