oracle中group by中的RANKing

Question

我有一个问题

Select age,qualification,sum(income) as total_income  from employee
group by age,qualification;

我想要找到基于total_income的年龄和资质组的排名。

例如

19|Grad|5000|rank:1
19|Grad|4000|rank:2
19|Grad|3000|rank:3
26|Grad|6000|rank:1
26|Grad|5000|rank:2
26|PosG|8000|rank:1
26|PosG|6000|rank:2

我可以在Oracle中执行此操作吗？我试着使用partition by，但没能弄清楚。

Answer 1

SQL Fiddle

Oracle 11g R2架构设置

CREATE TABLE Employees ( Age, Qualification, Income ) AS
          SELECT 19, 'Grad', 5000 FROM DUAL
UNION ALL SELECT 19, 'Grad', 4000 FROM DUAL
UNION ALL SELECT 19, 'Grad', 3000 FROM DUAL
UNION ALL SELECT 26, 'Grad', 6000 FROM DUAL
UNION ALL SELECT 26, 'Grad', 5000 FROM DUAL
UNION ALL SELECT 26, 'PosG', 8000 FROM DUAL
UNION ALL SELECT 26, 'PosG', 6000 FROM DUAL;

查询1

SELECT Age,
       Qualification,
       Income,
       RANK() OVER ( PARTITION BY Age, Qualification ORDER BY Income DESC ) AS "Rank"
FROM   Employees

| AGE | QUALIFICATION | INCOME | Rank |
|-----|---------------|--------|------|
|  19 |          Grad |   5000 |    1 |
|  19 |          Grad |   4000 |    2 |
|  19 |          Grad |   3000 |    3 |
|  26 |          Grad |   6000 |    1 |
|  26 |          Grad |   5000 |    2 |
|  26 |          PosG |   8000 |    1 |
|  26 |          PosG |   6000 |    2 |

查询2

WITH total_incomes AS (
  SELECT Age,
         Qualification,
         SUM( Income ) AS total_income
  FROM   Employees
  GROUP BY
         Age,
         Qualification
)
SELECT Age,
       Qualification,
       total_income,
       RANK() OVER ( ORDER BY total_income DESC ) AS "Rank"
FROM   total_incomes

| AGE | QUALIFICATION | TOTAL_INCOME | Rank |
|-----|---------------|--------------|------|
|  26 |          PosG |        14000 |    1 |
|  19 |          Grad |        12000 |    2 |
|  26 |          Grad |        11000 |    3 |

Answer 2

select  age,qualification,total_income
row_number() over (partition by age,qualification order by income desc) as rank from
(
Select age,qualification,sum(income) as total_income  from employee
group by age,qualification
) T1

Answer 3

Select 
          Age,
          Qualification,
          sum(income) as totalIncome,
          dense_rank () over (order by 
                             sum(income) desc) as DRnk    from exam_RG 
    group by age,Qualification

Age Qualification   totalIncome DRnk
26  Grad            21000        1
19  Grad            12000        2