select * from sheng out join city on sheng.sid=city.cid
select * from sheng left join city on sheng.sid=city.cid
select * from sheng right join city on sheng.sid=city.cid
select * from sheng left join city on sheng.sid=city.cid
select * from sheng right join city on sheng.sid=city.cid
解决方案 »
免费领取超大流量手机卡,每月29元包185G流量+100分钟通话, 中国电信官方发货