Postgresql：如何计算按ID分组的每日平均值的平均值

Question

我正在尝试计算按月分组的每日平均交易的平均值。 我有以下交易表：
交易表

我想得到以下结果：
结果表

  

Average_Amount_Credited =（每月Amount_Credited总数/每月天数）/使用月数

     

Average_Amount_Debited =（每月Amount_Debited总和/每月天数）/使用月数

为了得出结果表，我使用30作为每月的天数。 我还想计算每个月balance amount(Amount_Credited - Amount_Debited)为正或负的次数，如结果表所示。

以下是我使用的查询：

SELECT 
 "T"."ID", 
 date_trunc('month',"T"."Date_Transaction") AS "PERIOD",
 SUM(COALESCE("T"."Amount_Credited",0))/30 AS "Average Amount_Credited",
 SUM(COALESCE("T"."Amount_Debited",0))/30 AS "Average Amount_Debited",
 (CASE WHEN (SUM(COALESCE("T"."Amount_Credited",0))/30 - SUM(COALESCE("T"."Amount_Debited",0))/30) >0 
       THEN '1' 
       WHEN (SUM(COALESCE("T"."Amount_Credited",0))/30 - SUM(COALESCE("T"."Amount_Debited",0))/30) <0 
       THEN '0' 
 END) "Status Balance" 
FROM "Transaction" "T" 
WHERE "T"."ID" = '1' 
GROUP BY "T"."ID", date_trunc('month',"T"."Date_Transaction")

正如您将通过我的查询看到它每月返回一行但我想按ID返回一行，显示不同期间平均值的平均值。