--已知：两种排名方式(分区和不分区):使用和不使用partition

--两种计算方式(连续,不连续),对应函数：dense_rank,rank

·查询原始数据：学号,姓名,科目名,成绩

select * from t_score

·查询各学生科目为Oracle排名(简单排名) select sc.s_id,sc.s_name,sub_name,sc.score, rank() over (order by score desc) 名次 from t_score sc where sub_name='Oracle'

对比：rank()与dense_rank()：非连续排名与连续排名(都是简单排名) select sc.s_id,sc.s_name,sub_name,sc.score, dense_rank() over (order by score desc) 名次 from t_score sc where sub_name='Oracle'

·查询各学生各科排名(分区排名) select sc.s_id,sc.s_name,sub_name,sc.score, rank() over (partition by sub_name order by score desc) 名次 from t_score sc

·查询各科前2名(分区排名)

·类似：新闻表,求栏目点击率在前3位的新闻。

商品表,求各类别销售额在前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

·查询各同学总分 select s_id,s_name,sum(score) sum_score from t_score group by s_id,s_name

·根据总分查询各同学名次 select x.*, rank() over (order by sum_score desc) 名次 from ( select s_id,s_name,sum(score) sum_score from t_score group by s_id,s_name ) x

语法： rank() over (order by 排序字段 顺序) rank() over (partition by 分组字段 order by 排序字段 顺序) 1.顺序：asc|desc 名次与业务相关： 示例：找求优秀学员：成绩：降序 迟到次数：升序 2.分区字段：根据什么字段进行分区。 问题：分区与分组有什么区别? ·分区只是将原始数据进行名次排列(记录数不变), ·分组是对原始数据进行聚合统计(记录数变少,每组返回一条),注意：聚合。

脚本：

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, '张三 ', '语文', 80); insert into t_score (autoid, s_id, s_name, sub_name, score) values (9, 2, '李四 ', '数学', 80); insert into t_score (autoid, s_id, s_name, sub_name, score) values (10, 1, '张三 ', '数学', 0); insert into t_score (autoid, s_id, s_name, sub_name, score) values (11, 2, '李四 ', '语文', 50); insert into t_score (autoid, s_id, s_name, sub_name, score) values (12, 3, '张三丰 ', '语文', 10); insert into t_score (autoid, s_id, s_name, sub_name, score) values (13, 3, '张三丰 ', '数学', null); insert into t_score (autoid, s_id, s_name, sub_name, score) values (14, 3, '张三丰 ', '体育', 120); insert into t_score (autoid, s_id, s_name, sub_name, score) values (15, 4, '杨过 ', '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, '张三丰 ', 'oracle', 0); insert into t_score (autoid, s_id, s_name, sub_name, score) values (4, 4, '杨过 ', 'oracle', 77); insert into t_score (autoid, s_id, s_name, sub_name, score) values (17, 2, '李四 ', 'oracle', 77); commit;

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