Oracle排名函數(Rank)實例詳解

這篇文章主要介紹了Oracle排名函數(Rank)實例詳解,需要的朋友可以參考下

--已知：兩種排名方式(分區和不分區):使用和不使用partition

--兩種計算方式(連續,不連續),對應函數：dense_rank,rank

·查詢原始數據：學號,姓名,科目名,成績

select * from t_score

·查詢各科前2名(分區排名)

·類似：新聞表,求欄目點擊率在前3位的新聞。
商品表,求各類別銷售額在前10位的商品。

select * from (
select sc.s_id,sc.s_name,sub_name,sc.score,
dense_rank() over
(partition by sub_name order by score desc) 名次
from t_score sc
) x
where x.名次<=2

腳本：

create table t_score(
 autoid number primary key,
 s_id  number(3),
 s_name char(8) not null,
 sub_name varchar2(20),
 score number(10,2)
);
insert into t_score (autoid, s_id, s_name, sub_name, score)
values (8, 1, '張三', '語文', 80);
insert into t_score (autoid, s_id, s_name, sub_name, score)
values (9, 2, '李四', '數學', 80);
insert into t_score (autoid, s_id, s_name, sub_name, score)
values (10, 1, '張三', '數學', 0);
insert into t_score (autoid, s_id, s_name, sub_name, score)
values (11, 2, '李四', '語文', 50);
insert into t_score (autoid, s_id, s_name, sub_name, score)
values (12, 3, '張三豐', '語文', 10);
insert into t_score (autoid, s_id, s_name, sub_name, score)
values (13, 3, '張三豐', '數學', null);
insert into t_score (autoid, s_id, s_name, sub_name, score)
values (14, 3, '張三豐', '體育', 120);
insert into t_score (autoid, s_id, s_name, sub_name, score)
values (15, 4, '楊過', 'java', 90);
insert into t_score (autoid, s_id, s_name, sub_name, score)
values (16, 5, 'mike', 'c++', 80);
insert into t_score (autoid, s_id, s_name, sub_name, score)
values (3, 3, '張三豐', 'oracle', 0);
insert into t_score (autoid, s_id, s_name, sub_name, score)
values (4, 4, '楊過', 'oracle', 77);
insert into t_score (autoid, s_id, s_name, sub_name, score)
values (17, 2, '李四', 'oracle', 77);
commit;

ending...

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