查找谁给谁打电话

Question

我有这两个 table。订阅者 table 包含订阅者 ID 和他的 Phone 号码。 NetworkP2P 内容 SubscriberID、他呼叫的对象 AddresseeNumber 以及呼叫开始、结束的时间。

TABLE Subscriber 
(
    SubscriberID int,
    PhoneNumber char(10)
)

TABLE NetworkP2P 
(
    SubscriberID int,
    AddresseeNumber char(10),
    CallStart datetime,
    CallEnd datetime
)

示例数据：

订阅者

SubscriberID | PhoneNumber
1              613-555-0156
2              613-555-0112
3              613-555-0119
4              613-555-0182

网络P2P

SubscriberID | AddresseeNumber | CallStart               | CallEnd
1              613-555-0182      2013-02-03 08:27:00.000   2013-02-03 08:30:54.000
1              613-555-0119      2013-02-03 10:11:26.000   2013-02-03 10:14:26.000
1              613-555-3333      2013-02-03 15:13:58.000   2013-02-03 15:18:13.000
2              613-555-0156      2013-02-05 23:21:50.000   2013-02-05 23:24:50.000
2              613-555-0119      2013-04-05 23:21:50.000   2013-04-05 23:26:50.000
3              613-555-0112      2013-06-05 23:21:50.000   2013-06-05 23:26:50.000

并非所有 Phone 号码都与订阅者拥有的号码匹配。

如果我希望输出在给定月份内相互联系的订阅者（即订阅者 1 调用订阅者 2，反之亦然），我将如何处理？

所需输出示例：

 Caller | Reciever | CallerPhone | RecieverPhone
 1        4          613-555-0156  613-555-0182
 1        3          613-555-0156  613-555-0119
 2        1          613-555-0112  613-555-0156
 2        3          613-555-0112  613-555-0119
 3        2          613-555-0119  613-555-0112

Answer 1

您的模型并没有像评论中建议的那样错误 - 您的 NetworkP2P 可能只缺少一列（Reciever），它可以作为可选的外键（以满足您的句子“并非所有 Phone 数字都匹配订阅者拥有的那些。”)，但它看起来比关系更日志 table。

查询您想要的输出：

select
    caller.SubscriberID as Caller,
    reciever.SubscriberID as Reciever,
    caller.PhoneNumber as CallerPhone,
    nt.AddresseeNumber as RecieverPhone, -- better than reciever.PhoneNumber because you can use left join recievers to get missing substribers
    nt.CallStart,
    nt.CallEnd
from Subscriber as caller
inner join NetworkP2P as nt
    on nt.SubscriberID = caller.SubscriberID
inner join Subscriber as reciever
    on nt.AddresseeNumber = reciever.PhoneNumber
-- where '2021-02-03' between nt.CallStart and nt.CallEnd -- calls in 2021-02-03
-- where nt.CallStart between '2021-02-01' and '2021-02-28' -- calls in specific interval
-- where eomonth(nt.CallStart) = eomonth('2021-02-01') -- calls in specific month

您应该始终为所有 table 使用数据库架构（例如 dbo.Subscriber）。

Answer 2

订阅者的两个连接应该可以做到。

SELECT 
  nw.SubscriberID AS Caller
, rcvr.SubscriberID AS Receiver
, callr.PhoneNumber AS CallerPhone
, nw.AddresseeNumber AS ReceiverPhone
FROM NetworkP2P nw
JOIN Subscriber callr ON callr.SubscriberID = nw.SubscriberID
LEFT JOIN Subscriber rcvr ON rcvr.PhoneNumber = nw.AddresseeNumber
WHERE rcvr.SubscriberID IS NOT NULL
ORDER BY Caller, Receiver

Caller	Receiver	CallerPhone	ReceiverPhone
1	3	613-555-0156	613-555-0119
1	4	613-555-0156	613-555-0182
2	1	613-555-0112	613-555-0156
2	3	613-555-0112	613-555-0119
3	2	613-555-0119	613-555-0112

演示 db<>fiddle here

查找谁给谁打电话

Finding who called who

sql

tsql

sql-server