我说 SELECT COUNT(*) 会造成全表扫描,面试官让我回去等通知https://m.toutiaocdn.com/i6830769425667326471/?app=news_article×tamp=1590486758&use_new_style=0&req_id=2020052617523701000804602114032E7A&group_id=6830769425667326471&tt_from=android_share&utm_medium=toutiao_android&utm_campaign=client_share