Phonecall Database SQL Queries - sql

Question

I have been working on a database project for a phone call, here is a quick view of the diagram, callid is autoincremented in the call table, and sessionid is auto incremented in the session table, This way on a three way call the calls have the same diagram. I have entered in fictitious data in every field except sessionstarttime and sessionend time
Using phpmyadmin,
My question: I need to do a one query that will give me billable time for the customer aka a phonenumber.
Example phone call
A -> B from 12:00PM to 1:00PM
B -> C from 12:30PM to 1:30PM
A should be billed for 1hour
B should be billed for 1 1/2 hours (1:30 hrs)
C should be billed for 1 hour
Another Example
A -> B 12:00PM to 1:00PM
A -> C 12:30PM to 1:30PM
A should be billed for 1 1/2 hours (1:30 hrs)
B should be billed for 1hour
C should be billed for 1 hour
Here are the given data formats
- <table name="Account">
<column name="AccountID">1</column>
<column name="AcctHolderNum">617-100-5001</column>
<column name="ProviderID">1</column>
</table>
<table name="call">
<column name="callID">4</column>
<column name="callSender">617-719-9000</column>
<column name="callReceiver">617-730-8100</column>
<column name="callStartTime">2012-11-06 06:44:50</column>
<column name="callEndTime">2012-11-06 06:55:50</column>
<column name="sessionID">1</column>
- <table name="phoneNum">
<column name="phoneNum">617-300-2000</column>
<column name="phoneNumFN">Nigel</column>
<column name="phoneNumLN">Thornberry</column>
<column name="PhoneAccountID">2</column>
- <table name="Provider">
<column name="ProviderID">1</column>
<column name="ProviderName">T-Mobile</column>
</table>
- <table name="session">
<column name="sessionID">1</column>
<column name="sessionStartTime">2012-11-06 06:44:50</column>
<column name="sessionEndTime">2012-11-06 06:55:50</column>
Here is the ER diagram
http://i.stack.imgur.com/rrh4B.jpg
Here is what I got started thinking but drown myself in confusion trying to make the one query fit every possible input in the call table
FROM `call` as `call1`, `call` as `call2`, `call` as `call3`
WHERE `call1.sessionid` = `call2.sessionid` = `call3.sessionid`
AND <REST OF STUFF>
UNION /* not union all, but union*/
SELECT same as above but for three way calls
FROM `call` as `call1`, `call` as `call2`,
WHERE `call1.sessionid` = `call2.sessionid`
AND <REST OF STUFF>
UNION
SELECT same as above but for two way calls
FROM `call`
WHERE <REST OF STUFF>
Also here are a couple of simple queries for reference
Calculates length of each call
SELECT TIMEDIFF(MIN(`callStartTime`), MAX(`callEndTime`))
FROM `call` GROUP BY `callID`
Calculates length of each session
SELECT TIMEDIFF(MIN(`callStartTime`), MAX(`callEndTime`))
FROM `call` GROUP BY `sessionID`
Minutes of calls made (note callsender) by account
SELECT SUM(TIMEDIFF(`callStartTime`, `callEndTime`))
FROM `call`, `Phonenum`
WHERE `phoneNum.phoneNum` = `call.callSender`
GROUP BY `phoneAccountID`
Minutes of calls recieved (note callreciever) by account
SELECT SUM(TIMEDIFF(`callStartTime`, `callEndTime`))
FROM `call`, `Phonenum`
WHERE `phoneNum.phoneNum` = `call.callReciever` GROUP BY `phoneAccountID`
Here is the xml output for the schema
- <pma:structure_schemas>
- <pma:database name="jr_Team5" collation="utf8_general_ci" charset="utf8">
<pma:table name="Account">CREATE TABLE `Account` ( `AccountID` int(11) NOT NULL AUTO_INCREMENT COMMENT 'AI Primary Key', `AcctHolderNum` varchar(50) NOT NULL COMMENT 'Account Holder''s Phone Number i.e. "617-100-5001"', `ProviderID` int(11) DEFAULT NULL COMMENT 'Foreign Key from "ProviderID"', PRIMARY KEY (`AccountID`), KEY `AcctHolderNum` (`AcctHolderNum`), KEY `ProviderID` (`ProviderID`), CONSTRAINT `Account_ibfk_1` FOREIGN KEY (`ProviderID`) REFERENCES `Provider` (`ProviderID`) ) ENGINE=InnoDB AUTO_INCREMENT=7 DEFAULT CHARSET=utf8;</pma:table>
<pma:table name="call">CREATE TABLE `call` ( `callID` int(11) NOT NULL AUTO_INCREMENT COMMENT 'AI Primary Key', `callSender` varchar(50) NOT NULL COMMENT 'Phone Number of Caller', `callReceiver` varchar(50) NOT NULL COMMENT 'Phone Number of Reciever', `callStartTime` datetime NOT NULL COMMENT 'Time Call Begins', `callEndTime` datetime NOT NULL COMMENT 'Time Call Ends', `sessionID` int(11) NOT NULL COMMENT 'Foreign Key from "SessionID"', PRIMARY KEY (`callID`), KEY `callSender` (`callSender`), KEY `callReceiver` (`callReceiver`), KEY `sessionID` (`sessionID`), CONSTRAINT `call_ibfk_1` FOREIGN KEY (`callSender`) REFERENCES `phoneNum` (`phoneNum`), CONSTRAINT `call_ibfk_2` FOREIGN KEY (`callReceiver`) REFERENCES `phoneNum` (`phoneNum`), CONSTRAINT `call_ibfk_3` FOREIGN KEY (`sessionID`) REFERENCES `session` (`sessionID`) ) ENGINE=InnoDB AUTO_INCREMENT=61 DEFAULT CHARSET=utf8;</pma:table>
<pma:table name="phoneNum">CREATE TABLE `phoneNum` ( `phoneNum` varchar(50) NOT NULL COMMENT 'Phone Number on Record', `phoneNumFN` varchar(50) DEFAULT NULL COMMENT 'First Name of Phone User', `phoneNumLN` varchar(100) DEFAULT NULL COMMENT 'Last Name of Phone User', `PhoneAccountID` int(11) DEFAULT NULL COMMENT 'Foreign Key from "AccountID"', PRIMARY KEY (`phoneNum`), KEY `PhoneAccountID` (`PhoneAccountID`), CONSTRAINT `phoneNum_ibfk_1` FOREIGN KEY (`PhoneAccountID`) REFERENCES `Account` (`AccountID`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8;</pma:table>
<pma:table name="Provider">CREATE TABLE `Provider` ( `ProviderID` int(11) NOT NULL AUTO_INCREMENT COMMENT 'AI Primary Key', `ProviderName` varchar(50) NOT NULL COMMENT 'Network Provider i.e. "Verizon" or "Sprint"', PRIMARY KEY (`ProviderID`) ) ENGINE=InnoDB AUTO_INCREMENT=5 DEFAULT CHARSET=utf8;</pma:table>
<pma:table name="session">CREATE TABLE `session` ( `sessionID` int(11) NOT NULL AUTO_INCREMENT COMMENT 'AI Primary Key', `sessionStartTime` datetime DEFAULT NULL COMMENT 'Session Begin Time', `sessionEndTime` datetime DEFAULT NULL COMMENT 'Session End Time', PRIMARY KEY (`sessionID`) ) ENGINE=InnoDB AUTO_INCREMENT=29 DEFAULT CHARSET=utf8;</pma:table>
</pma:database>
</pma:structure_schemas>
Thanks for your help in advance,any help/input/direction would be appreciated let me know if you think of any other complex queries possible for this database
Fourway call data example in xml
- <table name="call">
<column name="callID">40</column>
<column name="callSender">617-292-1309</column>
<column name="callReceiver">617-300-2000</column>
<column name="callStartTime">2012-10-31 09:07:35</column>
<column name="callEndTime">2012-10-31 11:07:35</column>
<column name="sessionID">7</column>
</table>
- <table name="call">
<column name="callID">41</column>
<column name="callSender">617-300-2000</column>
<column name="callReceiver">617-234-1234</column>
<column name="callStartTime">2012-10-31 09:37:35</column>
<column name="callEndTime">2012-10-31 12:37:35</column>
<column name="sessionID">7</column>
</table>
- <table name="call">
<column name="callID">42</column>
<column name="callSender">617-234-1234</column>
<column name="callReceiver">617-200-4000</column>
<column name="callStartTime">2012-10-31 10:37:35</column>
<column name="callEndTime">2012-10-31 11:37:35</column>
<column name="sessionID">7</column>

Answer 1

I think you have two problems here. The first is determining how much time to allot to each caller in a session. The second is to aggregate this information.
Let me assume that all the time for a given phone number in a session is contiguous. That is, there is no call from B--> from 12:00 to 12:15 (because C would not be contiguous). Then you can get the timings for each user within a session:
select c.sessionid, c.caller,
(max(c.EndTime) - min(c.StartTime)) as dur
from ((select c.sessionid, c.callSender as caller, c.StartTime, c.EndTime
from call c
) union all
(select c.sessionid, c.callReceiver, c.StartTime, c.EndTime
from call c
)
) c
on s.sessionid = c.sessionid
group by c.sessionid, c.caller
From this, you can then aggregate over all sessions.
If the calls periods within a session are not contiguous, then the problem is more challenging. The best way to solve this problem depends on the database and the functions available in the database.