PianoCoder

摘要： ----创建测试表create table student_score( name varchar2(20), subject varchar2(20), score number(4,1));-----插入测试数据insert into student_score (name,subject,score)values('张三','语文',78);insert into student_score (name,subject,score)values('张三','数学',88);insert into student_score 阅读全文