Question

The call log has the following columns:

CallingParty, CalledParty, Duration, EventTime

and the example data is the following:

X, a, 10, 10:20
X, b, 12, 10:34
X, c, 8, 12:08
a, X, 22, 12:45
X, a, 10, 13:55
d, X, 30, 15:01

What I would like to do is to calculate the statistics for each contact (how many times did the user X call the contact, what was the sum of outgoing calls duration, how many times did the contact call user X, and what was the sum of incoming calls duration). Actually I am trying to mine the data from the call log of user X.

The statistics for the example above would be the following:

contactName, incomingCallsCount, IncomingCallsDuration, OutgoingCallsCount, OutgoingCallsDuration
a, 1, 10, 2, 20
b, 0, 0, 1, 12
c, 0, 0, 1, 8
d, 1, 30, 0, 0

I tryed the following query with different joins () but couldn’t fet the right result

    SELECT t1.CallingParty AS Contact, t1.CallingPartyCount, t1.CallingPartyDuration, t2.CalledPartyCount, t2.CalledPartyDuration FROM
(SELECT e.CallingParty, COUNT(*) AS CallingPartyCount, SUM(CAST(REPLACE(e.Duration, 'NULL', '0') AS int)) AS CallingPartyDuration FROM Events e WHERE Duration <> 'NULL' GROUP BY e.CallingParty) t1
<JOIN>
(SELECT e.CalledParty, COUNT(*) AS CalledPartyCount, SUM(CAST(REPLACE(e.Duration, 'NULL', '0') AS int)) AS CalledPartyDuration FROM Events e WHERE Duration <> 'NULL' GROUP BY e.calledParty) t2
ON t1.CallingParty = t2.CalledParty

Does anyone know what would be the right query in order to get the correct statistics?

Thank You!

Answer 1

You shouldn’t be joining to begin with, it sounds more like a simple group by with sum and count.

SELECT CallingParty, CalledParty, SUM(Duration), COUNT(*)
FROM table
GROUP BY CallingParty, CalledParty

Now, you also need a set of all the users involved (a,b,c and d), that can be computed by using a UNION if you don’t have this somewhere else.

SELECT CallingParty FROM table
UNION
SELECT CalledParty FROM table

Then you just put these together using CTEs.

WITH outgoing AS (
    SELECT CallingParty, CalledParty, SUM(Duration), COUNT(*)
    FROM table
    GROUP BY CallingParty, CalledParty
), incoming AS (
    SELECT CalledParty, CallingParty, SUM(Duration), COUNT(*)
    FROM table
    GROUP BY CalledParty, CallingParty
), users AS (
   SELECT CallingParty AS UserID FROM table
   UNION
   SELECT CalledParty AS UserID FROM table
)
SELECT * 
FROM users
LEFT OUTER JOIN outgoing ON outgoing.CallingParty = UserID
LEFT OUTER JOIN incoming ON incoming.CalledParty = UserID

That’s should do it!