Oracle中RATIO_TO_REPORT() OVER()函数的作用是什么

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20:00:24 SYS@orcl> conn scott/tiger;Connected.20:00:30 SCOTT@orcl> create table test20:01:22  2  (20:01:22  3  name varchar(20),20:01:22  4  kemu varchar(20),20:01:22  5  score number20:01:22  6  );Table created.Elapsed: 00:00:00.0420:01:23 SCOTT@orcl> insert into test values('testa','yuwen',10);1 row created.Elapsed: 00:00:00.0220:01:35 SCOTT@orcl> insert into test values('testa','英语',100);1 row created.Elapsed: 00:00:00.0020:01:35 SCOTT@orcl> insert into test values('testb','yuwen',60);1 row created.Elapsed: 00:00:00.0120:01:36 SCOTT@orcl> insert into test values('testb','yuwen',120);1 row created.Elapsed: 00:00:00.0020:01:36 SCOTT@orcl> insert into test values('testc','yuwen',40);1 row created.Elapsed: 00:00:00.0020:01:37 SCOTT@orcl> commit;Commit complete.Elapsed: 00:00:00.0020:01:42 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 ratio220:03:32  5  from test ;NAME           SCORE   RATIO1   RATIO2-------------------- ---------- ---------- ----------testa            10 .03030303 .043478261testb            60 .181818182 .260869565testc            40 .121212121 .173913043testb            120 .363636364 .52173913testa            100 .303030303     1Elapsed: 00:00:00.0020:03:33 SCOTT@orcl>

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