Job to retrieve difference in seconds (sometimes days)

Question

Hi, good day everyone.
I managed (with your help btw) to get the difference (in seconds for each time an UTR 'NAME' fails and return) with a job which runs every time at morning for the last day (sysdate -1), the problem is that I need to retrieve the data when the time is null (when the UTR didn't return that day), here's an example:
CREATE TABLE     evtmsg
(       evt_date             DATE,
     message          VARCHAR2 (50)
INSERT INTO evtmsg (evt_date, message) VALUES (TO_DATE ('04/10/2010 8:39:05', 'DD/MM/YYYY HH24:MI:SS'), 'UTR 02MCD-1 fail');*
INSERT INTO evtmsg (evt_date, message) VALUES (TO_DATE ('04/10/2010 8:39:05', 'DD/MM/YYYY HH24:MI:SS'), 'UTR 02MAD-1 fail');*
INSERT INTO evtmsg (evt_date, message) VALUES (TO_DATE ('04/10/2010 8:39:08', 'DD/MM/YYYY HH24:MI:SS'), 'UTR 02MCD-1 return');*
INSERT INTO evtmsg (evt_date, message) VALUES (TO_DATE ('04/10/2010 8:39:50', 'DD/MM/YYYY HH24:MI:SS'), 'UTR 02ZPD-1 fail');*
INSERT INTO evtmsg (evt_date, message) VALUES (TO_DATE ('04/10/2010 8:39:50', 'DD/MM/YYYY HH24:MI:SS'), 'UTR 02MAD-1 return');*
INSERT INTO evtmsg (evt_date, message) VALUES (TO_DATE ('05/10/2010 5:40:22', 'DD/MM/YYYY HH24:MI:SS'), 'UTR 02MCD-1 fail');
INSERT INTO evtmsg (evt_date, message) VALUES (TO_DATE ('05/10/2010 8:38:50', 'DD/MM/YYYY HH24:MI:SS'), 'UTR 02ZPD-1 return');In this case, if today was 5th (after running the job in the morning (01:00:00 a.m)), I'd have the next outcome:
Select * from qtyuna;
04/10/2010 8:39:05     04/10/2010 8:39:08   UTR 02MCD-1    3
04/10/2010 8:39:05     04/10/2010 8:39:50   UTR 02MAD-1    45
04/10/2010 8:39:50     null                           UTR 02ZPD-1    nullAnd if I do the same query on 6th (after the job) I'd like to get this:
Select * from qtyuna;
04/10/2010 8:39:05     04/10/2010 8:39:08   UTR 02MCD-1    3
04/10/2010 8:39:05     04/10/2010 8:39:50   UTR 02MAD-1    45
04/10/2010 8:39:50     05/10/2010 8:39:55   UTR 02ZPD-1     86405
05/10/2010 5:40:22     null                           UTR 02MCD-1    nullThe job I have is this
INSERT INTO qtyuna (datefa, datere, rtunam, timefa)
                SELECT evt_date_fallo, evt_date_retorno, id, TO_CHAR(TO_CHAR(evt_date_retorno, 'SSSSS') - TO_CHAR(evt_date_fallo, 'SSSSS'))seconds,
                FROM    (SELECT evt_date evt_date_fallo,
                LEAD(evt_date) OVER (partition by id ORDER BY id||TO_CHAR(evt_date, 'yyyymmddhh24miss')||CASE status WHEN 'return' THEN 1 ELSE 2 END) evt_date_retorno,
                id,
                status
                  FROM  (SELECT evt_date,
                      SUBSTR(message, 1, 11) id,
                      SUBSTR(message, 13) status
                      FROM   [email protected]
                      WHERE  message LIKE 'UTR%'
                      AND    categ = 1
                      AND    TRUNC(evt_date) = TRUNC(SYSDATE - 1)))
                  WHERE    status like '%fail%'
                  ORDER BY evt_date_fallo;I don't know if I need another job to do that... if so, could you tell me how?
Regards

Answer 1

Hi,
It looks like the main problem is how you are computing the seconds column.
In Oracle, if you subtract one date from another, you get the difference in units of 1 day. If you want the difference in seconds, multiply the difference in days by the number of seconds in one day. There's no need to use TO_CHAR, and nothing special has to be done if the DATEs are on different calendar days.
In your case, once you have the two DATEs identified, the way to get the number of seconds between them is:
(evt_date_retorno - evt_date_fallo) * 24 * 60 * 60because each day has 24 hours, each hour has 60 minutes, and each minute has 60 seconds.
There are lots of other things you could change. In particular, the way you are using LEAD is very confusing. If you are using Oracle 10 or higher, then I suggest using FIRST_VALUE instead, like this:
DEFINE     TEST_SYSDATE     = "(DATE '2010-10-05' + (1 / 24))"
-- INSERT INTO qtyuna (datefa, datere, rtunam, timefa)     -- Removed for testing
WITH    got_evt_date_retorno     AS
     SELECT  evt_date               AS evt_date_fallo
     ,     LAST_VALUE ( CASE
                            WHEN  SUBSTR (message, 13) = 'return'
                       THEN  evt_date
                    END
                      IGNORE NULLS
                  ) OVER ( PARTITION BY  SUBSTR (message, 1, 11)
                               ORDER BY       evt_date          DESC
                      )             AS evt_date_retorno
     ,       SUBSTR (message, 1, 11)            AS id
     ,     SUBSTR (message, 13)            AS status
     FROM     evtmsg
     WHERE     SUBSTR (message, 1, 3)     = 'UTR'               -- More efficient than LIKE
--     AND     categ                     = 1               -- There's no categ in the sample data
     AND     evt_date          < TRUNC (&test_sysdate)     -- Use SYSDATE in Production
SELECT       evt_date_fallo
,       evt_date_retorno
,       id
,       (evt_date_retorno - evt_date_fallo) * 24 * 60 * 60     AS seconds
FROM       got_evt_date_retorno
WHERE       SUBSTR (status, -4)     = 'fail'               -- Do we need SUBSTR here?
-- ORDER BY  evt_date_fallo                         -- For testing only
;You wrote this with a separate sub-query to get id and status from message. That's not a bad idea; you could add another sub-query above.
I changed SYSDATE to a substritution variable for testing. After you're through with testing, change &test_stsdate to SYSDATE.