获取最高涨价

Question

我在解决这个问题时遇到了问题 我需要找到价格增长率最高的项目。 这是我的代码：

Select 
    q.Grocery_Item, 
    TO_CHAR(q.Price_IN_2000, '$90.00') price_in_2000, 
    TO_CHAR(q.Estimated_Price_In_2025, '$90.00') price_in_2025, 
    TO_CHAR(w.MY_OUTPUT,'9,990') || '%' as My_Output 
From 
    GROCERY_PRICES q, 
    (SELECT 
    GROCERY_ITEM, 
    (((Estimated_Price_In_2025-Price_IN_2000)/Price_IN_2000)*100) as MY_OUTPUT 
    FROM 
    GROCERY_PRICES 
) w 
Where 
    q.GROCERY_ITEM = w.GROCERY_ITEM and w.my_output in (select max(w.my_output) from GROCERY_PRICES group by grocery_item) 
GROUP BY 
w.MY_OUTPUT, q.GROCERY_ITEM, q.Price_IN_2000, q.Estimated_Price_In_2025 

我的输出是：

GROCERY_ITEM     PRICE_IN_2000 PRICE_IN_2025 MY_OUTPUT 
------------------------------ ------------- ------------- --------- 
B_001       $0.80   $2.64   230% 
B_002       $2.72   $7.36   171% 
M_004       $2.70   $5.65   109% 
T_006       $5.70   $6.65   17% 
R_003       $4.00  $13.20   230% 
E_001       $0.62   $1.78   187% 

6 rows selected 

这基本上是我的表中的所有数据

什么，我需要得到的是：

GROCERY_ITEM     PRICE_IN_2000 PRICE_IN_2025 MY_OUTPUT 
------------------------------ ------------- ------------- --------- 
B_001       $0.80   $2.64   230% 
R_003       $4.00  $13.20   230% 

对不起新在这里，不知道如何格式化我的问题:(

在此先感谢。

Answer 1

像这样：

with price_delta as (
    select grocery_item, 
     price_in_2000, 
     ESTIMATED_PRICE_IN_2025, 
     ((ESTIMATED_PRICE_IN_2025 - Price_IN_2000)/Price_IN_2000)*100 as delta, 
     rank() over (order by ((ESTIMATED_PRICE_IN_2025 - Price_IN_2000)/Price_IN_2000)*100 desc) as rnk 
    from grocery_prices 
) 
select grocery_item, 
     price_in_2000, 
     ESTIMATED_PRICE_IN_2025, 
     delta 
from price_delta 
where rnk = 1; 

SQLFiddle（甲骨文）：http://sqlfiddle.com/#!4/43379/2