Oracle 数据处理

1. 对维度按照度量值的排名进行统计得分，第一名100分，第二名99分，第三名98……可以先进行排名，然后用 得分值+1，减去排名既是所得分数。

-- 建表
  
create table province_people(
city varchar2(100),
people_name varchar2(100), --姓名
sex varchar2(1)  --性别 1 男  2 女  0 未知
)

-- 插入数据

insert into province_people (city, people_name, sex)values ('西安', '大王', '2'); 
insert into province_people (city, people_name, sex)values ('西安', '刘一', '1'); 
insert into province_people (city, people_name, sex)values ('西安', '陈二', '2');
insert into province_people (city, people_name, sex)values ('西安', '张三', '0');
insert into province_people (city, people_name, sex)values ('西安', '李四', '1');
insert into province_people (city, people_name, sex)values ('宝鸡', '王五', '0');
insert into province_people (city, people_name, sex)values ('宝鸡', '赵六', '1');
insert into province_people (city, people_name, sex)values ('宝鸡', '孙七', '2');
insert into province_people (city, people_name, sex)values ('宝鸡', '周八', '2');
insert into province_people (city, people_name, sex)values ('汉中', '吴九', '1');
insert into province_people (city, people_name, sex)values ('汉中', '郑十', '1');
commit;
 
--查询结果
 
select * from province_people;
 
select city, px, 101 - px
  from (select city, rank() over(order by count(people_name) desc) px
          from province_people
        having count(people_name) > 0
         group by city) t1;
 
--按照人数排名，第一名100分，第二名99分……

2. 相同维度下，不同度量值的数据进行统计个数，可以对度量值进行稍微的转换，将所需要的度量值转换为1，然后进行汇总。

-- 建表
  
create table province_people(
city varchar2(100),
people_name varchar2(100), --姓名
sex varchar2(1)  --性别 1 男  2 女  0 未知
)

-- 插入数据

insert into province_people (city, people_name, sex)values ('西安', '大王', '2'); 
insert into province_people (city, people_name, sex)values ('西安', '刘一', '1'); 
insert into province_people (city, people_name, sex)values ('西安', '陈二', '2');
insert into province_people (city, people_name, sex)values ('西安', '张三', '0');
insert into province_people (city, people_name, sex)values ('西安', '李四', '1');
insert into province_people (city, people_name, sex)values ('宝鸡', '王五', '0');
insert into province_people (city, people_name, sex)values ('宝鸡', '赵六', '1');
insert into province_people (city, people_name, sex)values ('宝鸡', '孙七', '2');
insert into province_people (city, people_name, sex)values ('宝鸡', '周八', '2');
insert into province_people (city, people_name, sex)values ('汉中', '吴九', '1');
insert into province_people (city, people_name, sex)values ('汉中', '郑十', '1');
commit;

--查询结果

select city,
       count(people_name) num,
       sum(decode(sex, 1, 1, 0)) man_num,
       sum(decode(sex, 2, 1, 0)) femalel_num,
       sum(decode(sex, 0, 1, 0)) null_num
  from province_people
 group by city;
 
--数据经过转换，可以一次性查出各种类型的数据数量