案例2：⽤⼀条SQL查询出数学语⽂成绩都⼤于80分的学⽣姓输入姓名查询成绩在线名？⽅法1：查出科⽬成绩有⼩于80分的学⽣姓名，再约束并去重学⽣不等于查出来的姓名select distinct A.name from t_score A where A.name not in(select distinct B.name from t_score B where B.fenshu <=80)⽅...