MySQL的總和一個字段基於第二個「普通」字段

Question

不是SQL的傢伙，所以我陷入困境，所以我會保持這個簡單的

+--------------+------------------------+ 
| RepaymentDay | MonthlyRepaymentAmount | 
+--------------+------------------------+ 
|   3 |    0.214847 | 
|   26 |    0.219357 | 
|   24 |    0.224337 | 
|   5 |    0.224337 | 
|   18 |    0.224337 | 
|   28 |    0.214847 | 
|   1 |    0.224337 | 
|   28 |    0.327079 | 
+--------------+------------------------+ 

我要尋找的查詢會然後給一些像;

+--------------+------------------------+ 
| RepaymentDay | MonthlyRepaymentAmount | 
+--------------+------------------------+ 
|   1 |    0.224337 | 
|   3 |    0.214847 | 
|   5 |    0.224337 | 
|   18 |    0.224337 | 
|   24 |    0.224337 | 
|   26 |    0.219357 | 
|   28 |    0.541926 | 
+--------------+------------------------+ 

即在有多個記錄與「RepaymentDay」相同的值，來總結「MonthlyRepaymentAmount」的這些值。

我可以用perl或python在外部做，沒有問題，但我想嘗試和更熟悉SQL。 任何想法？

Answer 1

SELECT RepaymentDay, SUM(MonthlyRepaymentAmount) AS MonthlyRepaymentAmount 
FROM YourTable 
GROUP BY RepaymentDay 
ORDER BY RepaymentDay 

Answer 2

select從table_name group的RepaymentDay，sum（MonthlyRepaymentAmount）by RepaymentDay;