--班級表create table CLASS( ID    VARCHAR2(5) not null primary key, CLASSNAME VARCHAR2(10));--學生表create table STUDENT( ID   VARCHAR2(10) not null primary key, NAME  VARCHAR2(10), AGE   NUMBER(3), CLASSID VARCHAR2(5));--科目表create table subject(id varchar2(10) primary key,subname varchar2(10));--分數表 create table score( sid varchar2(4), subid varchar2(10), score number(4,1));

select s1.name 姓名,    s1.age 年齡,    s1.classname 班級,    score_.sid,    數學,    語文,    物理,    化學,    (數學 + 語文 + 物理 + 化學) 總分 from (select s.sid,        sum(decode(s.subid, 'SUB001', s.score)) 數學,        sum(decode(s.subid, 'SUB002', s.score)) 語文,        sum(decode(s.subid, 'SUB003', s.score)) 物理,        sum(decode(s.subid,'SUB004',s.score)) 化學     from score s     group by s.sid) score_ right join (select st.id, st.name, st.age, c.classname        from student st, class c       where c.id = st.classid) s1 on s1.id = score_.sid order by 總分;