1 -- 学生成绩表
 2 create table grade (
 3     id varchar2(64) not null,
 4     name varchar2(20) not null,
 5     course varchar2(100) not null,
 6   score number(3) not null,
 7     primary key (id)
 8 )
 9
10 -- 初始化数据
11 insert into grade values( '100001', '张三', '语文', 75);
12 insert into grade values( '100002', '张三', '数学', 80);
13 insert into grade values( '100003', '张三', '英语', 80);
14
15 insert into grade values( '100004', '李四', '语文', 86);
16 insert into grade values( '100005', '李四', '数学', 66);
17 insert into grade values( '100006', '李四', '英语', 81);
18
19 insert into grade values( '100007', '王五', '语文', 92);
20 insert into grade values( '100008', '王五', '数学', 78);
21 insert into grade values( '100009', '王五', '英语', 82);
22
23 insert into grade values( '100010', '赵六', '语文', 80);
24 insert into grade values( '100011', '赵六', '数学', 90);
25 insert into grade values( '100012', '赵六', '英语', 77);
26
27 insert into grade values( '100013', '李明', '语文', 69);
28 insert into grade values( '100014', '李明', '数学', 75);
29 insert into grade values( '100015', '李明', '英语', 80);

1 select
2 t.name "姓名",
3 sum(decode(t.course, '语文', t.score , 0)) "语文",
4 sum(decode(t.course, '数学', t.score , 0)) "数学",
5 sum(decode(t.course, '英语', t.score , 0)) "英语"
6 from grade t
7 group by t.name

 1 --列转行
 2 create table sc_grade (
 3     id varchar2(64) not null,
 4     name varchar2(20) not null,
 5     cn_score number(3) not null,
 6     math_score number(3) not null,
 7   en_score number(3) not null,
 8     primary key (id)
 9 )
10
11 --初始数据
12 insert into sc_grade values ('10001', '张三', 75, 80, 80);
13 insert into sc_grade values ('10002','王五', 92, 78, 82);
14 insert into sc_grade values ('10003','赵六', 80, 90, 77);
15 insert into sc_grade values ('10004','李四', 86, 66, 81);
16 insert into sc_grade values ('10005','李明', 69, 75, 80);

1 select name "姓名" , '语文' course, cn_score as score from sc_grade
2 union
3 select name "姓名" , '数学' course, math_score as score from sc_grade
4 union
5 select name "姓名" , '英语' course, en_score as score from sc_grade
6 order by "姓名" , course 

1 -- 结果存放表
2 create table test_sc_grade (
3     name varchar2(20) not null,
4     course varchar2(100) not null,
5     score     number(3) not null
6 )    

1 insert all
2 into test_sc_grade(name,course,score) values(name, '语文', cn_score)
3 into test_sc_grade(name,course,score) values(name, '数学', math_score)
4 into test_sc_grade(name,course,score) values(name, '英语', en_score)
5 select name, cn_score, math_score, en_score from sc_grade;
6 commit;
7 select * from test_sc_grade