Splitting rows at specific times (not intervals)
Greetings.
I have a data set with fields that hold start and end times for specific events. These events have unique ID's and cross multiple time intervals. I'm looking for a way to split a single row in the dataset into multiple rows with new start and end times for each relevant time interval.
The examples I've found online describe ways (using the MODEL method) to split rows based on time intervals of a fixed length (24 hours, for example) but I'm looking for a way to split the records at a specific time (at 6am and 6pm.)
So this record set:
<tt>SELECT ID, START_DATE, END_DATE FROM EVENTTABLE
_ ID __________ Start_date __________ End Date _____
1228322 __ 21-NOV-11 17:51:29 __ 21-NOV-11 19:32:27
1228327 __ 21-NOV-11 14:53:24 __ 22-NOV-11 03:46:06
1228334 __ 21-NOV-11 03:32:53 __ 21-NOV-11 05:13:13
1183267 __ 25-SEP-11 16:09:13 __ 27-SEP-11 04:38:11</tt>
Would become:
<tt>SELECT ID, START_DATE, END_DATE FROM EVENTTABLE MODEL...
_ ID __________ Start_date __________ End Date _____
1228322 __ 21-NOV-11 17:51:29 __ 21-NOV-11 18:00:00
1228322 __ 21-NOV-11 18:00:00 __ 21-NOV-11 19:32:27
1228327 __ 21-NOV-11 14:53:24 __ 21-NOV-11 18:00:00
1228327 __ 21-NOV-11 18:00:00 __ 22-NOV-11 03:46:06
1228334 __ 21-NOV-11 03:32:53 __ 21-NOV-11 05:13:13
1183267 __ 25-SEP-11 16:09:13 __ 25-SEP-11 18:00:00
1183267 __ 25-SEP-11 18:00:00 __ 26-SEP-11 06:00:00
1183267 __ 26-SEP-11 06:00:00 __ 26-SEP-11 18:00:00
1183267 __ 26-SEP-11 18:00:00 __ 27-SEP-11 04:38:11</tt>
Notice that record 1183267 starts in one interval, crosses two whole intervals and ends in a fourth. This splitting of one event into many is required to create a record set that will guarantee a record for each of the relevant intervals.
Thanks in advance for your consideration!
SonyDADCuser wrote:
Greetings.
I have a data set with fields that hold start and end times for specific events. These events have unique ID's and cross multiple time intervals. I'm looking for a way to split a single row in the dataset into multiple rows with new start and end times for each relevant time interval.
The examples I've found online describe ways (using the MODEL method) to split rows based on time intervals of a fixed length (24 hours, for example) but I'm looking for a way to split the records at a specific time (at 6am and 6pm.)
So this record set:
<tt>SELECT ID, START_DATE, END_DATE FROM EVENTTABLE
_ ID __________ Start_date __________ End Date _____
1228322 __ 21-NOV-11 17:51:29 __ 21-NOV-11 19:32:27
1228327 __ 21-NOV-11 14:53:24 __ 22-NOV-11 03:46:06
1228334 __ 21-NOV-11 03:32:53 __ 21-NOV-11 05:13:13
1183267 __ 25-SEP-11 16:09:13 __ 27-SEP-11 04:38:11</tt>
Would become:
<tt>SELECT ID, START_DATE, END_DATE FROM EVENTTABLE MODEL...
_ ID __________ Start_date __________ End Date _____
1228322 __ 21-NOV-11 17:51:29 __ 21-NOV-11 18:00:00
1228322 __ 21-NOV-11 18:00:00 __ 21-NOV-11 19:32:27
1228327 __ 21-NOV-11 14:53:24 __ 21-NOV-11 18:00:00
1228327 __ 21-NOV-11 18:00:00 __ 22-NOV-11 03:46:06
1228334 __ 21-NOV-11 03:32:53 __ 21-NOV-11 05:13:13
1183267 __ 25-SEP-11 16:09:13 __ 25-SEP-11 18:00:00
1183267 __ 25-SEP-11 18:00:00 __ 26-SEP-11 06:00:00
1183267 __ 26-SEP-11 06:00:00 __ 26-SEP-11 18:00:00
1183267 __ 26-SEP-11 18:00:00 __ 27-SEP-11 04:38:11</tt>
Notice that record 1183267 starts in one interval, crosses two whole intervals and ends in a fourth. This splitting of one event into many is required to create a record set that will guarantee a record for each of the relevant intervals.
Thanks in advance for your consideration!Neat problem.
This assumes you have a reasonably recent version of Oracle, and i only tested it for your "complex" case spanning multiple days because i didn't want to type out a bunch of sample data. Should work on all your data sets though (i always say this when i do incomplete testing :).
with
time_data as
select
1 as col1
, to_date('25-sep-2011 16:09:13', 'dd-mon-yyyy hh24:mi:ss') as start_date
, to_date('27-sep-2011 4:38:11', 'dd-mon-yyyy hh24:mi:ss') as end_date
from dual
select *
from
select
col1
, greatest
trunc(t.start_date, 'dd') - interval '6' hour + (interval '12' hour * m.column_value)
, t.start_date
) as start_date
, least
trunc(t.start_date, 'dd') + interval '6' hour + (interval '12' hour * m.column_value)
, t.end_date
) as end_date
from time_data t,
table(cast(multiset(select level from dual connect by level <= ceil(end_date - start_date) * 2) as sys.odcinumberlist)) m
where start_date < end_date;
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