Oracle百分比分析函数RATIO_TO_REPORT() OVER()实例详解

20:00:24 SYS@orcl> conn scott/tiger;
Connected.
20:00:30 SCOTT@orcl> create table test
20:01:22  2  (
20:01:22  3  name varchar(20),
20:01:22  4  kemu varchar(20),
20:01:22  5  score number
20:01:22  6  );
Table created.
Elapsed: 00:00:00.04
20:01:23 SCOTT@orcl> insert into test values('testa','yuwen',10);
1 row created.
Elapsed: 00:00:00.02
20:01:35 SCOTT@orcl> insert into test values('testa','英语',100);
1 row created.
Elapsed: 00:00:00.00
20:01:35 SCOTT@orcl> insert into test values('testb','yuwen',60);
1 row created.
Elapsed: 00:00:00.01
20:01:36 SCOTT@orcl> insert into test values('testb','yuwen',120);
1 row created.
Elapsed: 00:00:00.00
20:01:36 SCOTT@orcl> insert into test values('testc','yuwen',40);
1 row created.
Elapsed: 00:00:00.00
20:01:37 SCOTT@orcl> mit;
Commit plete.
Elapsed: 00:00:00.00
20:01:42 SCOTT@orcl> select name,
20:03:32  2  score,
20:03:32  3   ratio_to_report(score) over() as ratio1,
20:03:32  4  ratio_to_report(score) over(partition by kemu) as ratio2
20:03:32  5  from test ;
NAME           SCORE   RATIO1   RATIO2
-------------------- ---------- ---------- ----------
testa            10 .03030303 .043478261
testb            60 .181818182 .260869565
testc            40 .121212121 .173913043
testb            120 .363636364 .52173913
testa            100 .303030303     1
Elapsed: 00:00:00.00
20:03:33 SCOTT@orcl>