計算邊際貢獻

-2

我想在同一時間使用子查詢和計算我的SQL項目我哪裏有下列信息的表答：計算邊際貢獻

表A

Month_revenue Income Cost 
------------------------- 
Jan   100 50 
Feb   90  60 
Mar   80  40

我想找出1月份，2月份的利潤率和1月至2月份的利潤差異。我可以在一個查詢中這樣做嗎？

顯示屏應具有以下格式：

Jan  Feb  Mar   Jan/Feb   Feb/Mar 
--------------------------------------------------------------- 
100-50 90 - 60 80-40 (100-50) - (90-60) (90-60) - (80-40)

謝謝！

來源

2016-05-13 Kane

定義'貢獻Margin'？只是來自'收入 - 成本'的數字，或者你想要一個像'100 - 50'這樣的字符串？ \t請閱讀[**如何提問**]（http://stackoverflow.com/help/how-to-ask） \t \t這裏是[** START **]（ http://spaghettidba.com/2015/04/24/how-to-post-at-sql-question-on-a-public-forum/）瞭解如何提高您的問題質量並獲得更好的答案。 –

所以你想要一列五列，而不是五列結果？並且保證只有三個記錄，一個是一月，一個是二月，一個是三月在你的桌子上？ –

你正在尋找數據透視表...這是一個很好的例子http://stackoverflow.com/a/26297463/3470178 –

您可以簡單地使用三個選項表：

select 
    jan.income - jan.cost as jan, 
    feb.income - feb.cost as feb, 
    mar.income - mar.cost as mar, 
    (jan.income - jan.cost) - (feb.income - feb.cost) as jan_feb, 
    (feb.income - feb.cost) - (mar.income - mar.cost) as feb_mar 
from 
    (select * from mytable where Month_revenue = 'Jan') jan 
cross join 
    (select * from mytable where Month_revenue = 'Feb') feb 
cross join 
    (select * from mytable where Month_revenue = 'Mar') mar;

或者你也可以有條件地彙總：

select 
    sum(case when Month_revenue = 'Jan' then income - cost end) as jan, 
    sum(case when Month_revenue = 'Feb' then income - cost end) as feb, 
    sum(case when Month_revenue = 'Mar' then income - cost end) as mar, 
    sum(case when Month_revenue = 'Jan' then income - cost end) - 
    sum(case when Month_revenue = 'Feb' then income - cost end) as jan_feb, 
    sum(case when Month_revenue = 'Feb' then income - cost end) - 
    sum(case when Month_revenue = 'Mar' then income - cost end) as feb_mar 
from mytable;

來源

2016-05-13 14:53:16

計算邊際貢獻

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