在Oracle中查詢客戶和calldetails表的數據庫

Question

我有2個以下的表格。

1. customer - 有姓名，地址和telphoneNumber列。
2. CallDetails - 具有telphoneNumber，callDate，callDuration列。

我想知道在某些開始日期和結束日期之間獲得最高呼叫的客戶姓名和地址。

謝謝

Answer 1

請嘗試以下查詢。它爲我工作。

select CustomerName,Address from Customer 
where PhoneNumber IN 
    (SELECT PHONENUMBER FROM CallDetails 
    WHERE CallStartTime BETWEEN 'FromDateTime' AND 'ToDateTime' 
    GROUP BY PhoneNumber 
    having count(1)=(select TOP 1 count(1) from CallDetails 
       WHERE CallStartTime BETWEEN 'FromDateTime' AND 'ToDateTime' 
       group by PhoneNumber ORDER BY COUNT(1) DESC 
       ) 
    ) 
ORDER BY CustomerName