topic Re: Sorting events into timeslots in QlikView

Sorting events into timeslots

Sun, 28 Aug 2016 17:48:53 GMT

Hallo,

I load some million events from a psql database. The events occures over the day at any time and the entity contains a datetime-field. I want to count the events occuring at different times and days of a week, aggregated over some years.

Therefore i want to divide the 10080 minutes of a week in a numberd sequence of 10080/n slots, numbered from 1 to 10080/n. Example: MinutesOfTimeslot=15, timeslot nr.1 goes from 00:00:00 to 00:14:59 on monday an the last nr.672 from 23:45:00 to 23:59:59 on sunday.

I think to do the calculation during the load-process like this:

ODBC CONNECT TO PostgreSQL64;

LOAD "eventTime",

slot(enventTime,MinutesOfTimeslot) as slot_nr;

SQL SELECT *

FROM "events";

I am not very experienced in SQL or QLIKVIEW and don't know if there are any existing functions fullfilling my wishes. Later it could be interesting to consider vacation and public holidays to compare similar days or weeks over the years.

Any ideas?

Re: Sorting events into timeslots

Anil_Babu_Samineni — Sun, 28 Aug 2016 19:11:35 GMT

Can you post the data for MinutesOfTimeslot

Re: Sorting events into timeslots

Sun, 28 Aug 2016 20:01:08 GMT

MinutesOfTimeslot is a parameter for the length in minutes of a timeslot.When i choose this equal to 15, i will have 672 timslots in a week, with 10 - 1008 timeslots ...

Re: Sorting events into timeslots

MarcoWedel — Tue, 30 Aug 2016 00:00:37 GMT

Hi,

one solution might be:

tabEvents:
LOAD *,
    Interval(Floor(eventTimestamp-WeekStart(eventTimestamp),'00:01'),'d hh:mm') as eventTime;
LOAD RecNo() as eventID,
    Timestamp(Now()-Rand()*1000) as eventTimestamp
AutoGenerate 1000;

tabEventTime:
LOAD Distinct
    eventTime,
    IterNo() as MinutesOfTimeslot,
    Ceil(eventTime*1440/IterNo()) as slot_nr,
    Interval(Floor(eventTime,IterNo()/1440),'d hh:mm') as slot_time
Resident tabEvents
While IterNo() <= 1440;

hope this helps

regards

Marco

Re: Sorting events into timeslots

Thu, 01 Sep 2016 11:02:04 GMT

Hi,

thank you.

I am working with a free desktop version. Therefor i cannot read your example.

So i first tried to understand the code. After that i implemented, based on your example a solution. This works, but i saw some results i don't really understand in the moment, and i have to look for. It seems, there are some problems with the format of my event-timestamp and the functions ceil and floor returns values i cannot comprehend.

Furthermore i recognized, that my solution works, but is very slow.

Regards

Ruediger