`id` as `uid`, `updates`.`post_id`, `updates`.`id` as `upid`, `friends`.`id` as `fid`, `updates`.`user_id`, `updates`.`privacy`, `updates`.`updated_at`, `updates`.`created_at`, `friends`.`friend_status`, `updates`.`update_type` from `<em
我有3个表:opportunities,tr_opportunity_updates和我想得到3列,第一列是机会名称,第二列是最后一次更新的机会,第三是第二个最后更新的机会。FROM opportunities
LEFT JOIN opportunities_tr_opportunity_updates_1_c ON opportunities_tr_o