CODEWITHSUNDEEP
sqloracle-database
Barcat
Barcat

Reputation: 163

Create ranges of minutes (15) in select

I am creating a select which brings me beyond the results of the table a column with a range of 15 minutes.

What I am trying to do, is to group hours between 00:00 and 00:15 in a 0:15 range. After grouping the registers between 0:16 and 0:30 in a 0:30 range. This I will do for all hours in a day.

Below, I describe my select. If someone can help me develop a line of thought. Tks a lot.

CREATE OR REPLACE FORCE VIEW "ARADMIN"."GSC_VW_INC_DIARIOS"("ID_INCIDENTE", "STATUS_INCIDENTE", "DATAHORA_CRIACAO", "DATA_CRIACAO",       "HORA_CRIACAO", "PRIORIDADE", "IMPACTO", "URGÊNCIA")
AS
 SELECT T2318.C1,
CASE (T2318.C7)
  WHEN 0
  THEN 'NOVO'
  WHEN 1
  THEN 'DESIGNADO'
  WHEN 2
  THEN 'EM ANDAMENTO'
  WHEN 3
  THEN 'PENDENTE'
  WHEN 4
  THEN 'RESOLVIDO'
  WHEN 5
  THEN 'FECHADO'
  WHEN 6
  THEN 'CANCELADO'
END,
TO_CHAR(secs_to_datetime(T2318.C3),'DD/MM/YYYY HH24:MI:SS'),
TO_CHAR(secs_to_date(T2318.C3),'DD/MM/YYYY'),
CASE TO_CHAR(secs_to_hour(T2318.C3),'HH24:MI')
  WHEN TO_CHAR(secs_to_hour(T2318.C3),'HH24:MI') BETWEEN ('00:00' AND '00:15')
  THEN '00:15'
END,
CASE (T2318.C1000000164)
  WHEN 0
  THEN 'CRÍTICO'
  WHEN 1
  THEN 'ALTO'
  WHEN 2
  THEN 'MÉDIO'
  WHEN 3
  THEN 'BAIXO'
END,
CASE (T2318.C1000000163)
  WHEN 1000
  THEN 'EXTENSIVO/DIFUNDIDO'
  WHEN 2000
  THEN 'SIGNIFICATIVO/GRANDE'
  WHEN 3000
  THEN 'MODERADO/LIMITADO'
  WHEN 4000
  THEN 'MENOR/LOCALIZADO'
END,
CASE (T2318.C1000000162)
  WHEN 1000
  THEN 'CRÍTICO'
  WHEN 2000
  THEN 'ALTO'
  WHEN 3000
  THEN 'MÉDIO'
  WHEN 4000
  THEN 'BAIXO'
END
  FROM T2318
  WHERE T2318.C3 > 1434419999;

To ilustrate what I am trying. I will paste the print of select result

Result of Select

Upvotes: 1

Views: 902

Answers (2)

Alex Poole
Alex Poole

Reputation: 191235

If you're starting with a date value, or in this case a value that has been converted to a date, you can find which 15 minute block of the day it belongs to be manipulating the number of seconds past midnight; which you can get from to_char() with the SSSSS format model.

select to_char(sysdate, 'YYYY-MM-DD HH24:MI:SS') as now_time,
  to_char(sysdate, 'SSSSS') as now_secs
from dual;

NOW_TIME            NOW_S
------------------- -----
2015-06-18 18:25:49 66349

You can round the the number of seconds down to the start of a 15-minute period by dividing by 900 (15 * 60), truncating or flooring it to get an integer value, and multiply back by 900:

select to_char(sysdate, 'YYYY-MM-DD HH24:MI:SS') as now_time,
  to_char(sysdate, 'SSSSS') as now_secs,
  to_number(to_char(sysdate, 'SSSSS'))/900 as calc1,
  floor(to_number(to_char(sysdate, 'SSSSS'))/900) as calc2,
  floor(to_number(to_char(sysdate, 'SSSSS'))/900) * 900 as calc3
from dual;

NOW_TIME            NOW_S      CALC1      CALC2      CALC3
------------------- ----- ---------- ---------- ----------
2015-06-18 18:25:49 66349 73.7211111         73      65700

And you can convert that back to a time by adding it back to a date:

select to_char(sysdate, 'YYYY-MM-DD HH24:MI:SS') as now_time,
  to_char(sysdate, 'SSSSS') as now_secs,
  floor(to_number(to_char(sysdate, 'SSSSS'))/900) * 900 as calc3,
  to_char(date '1970-01-01'
    + (floor(to_number(to_char(sysdate, 'SSSSS'))/900) * 900 / 86400),
    'HH24:MI:SS') as calc4
from dual;

NOW_TIME            NOW_S      CALC3 CALC4  
------------------- ----- ---------- --------
2015-06-18 18:25:49 66349      65700 18:15:00

You probably want to preserve the date though, so you can add it to trunc(<original_date>) instead. Unless you only have data within a single day, or want to show the same time from multiple days bundled together, I suppose.

Here's a demo with 10 randomly-generated times, showing the 15-minute block they're assigned to:

with t (date_field) as (
  select sysdate - dbms_random.value(0, 1)
  from dual
  connect by level <= 10
)
select to_char(date_field, 'YYYY-MM-DD HH24:MI:SS') as datefield,
  to_char(date_field, 'SSSSS') as time_secs,
  floor(to_number(to_char(date_field, 'SSSSS'))/900) * 900
    as fifteen_min_block_secs,
  to_char(trunc(date_field)
    + (floor(to_number(to_char(date_field, 'SSSSS'))/900) * 900) / 86400,
    'YYYY-MM-DD HH24:MI:SS') as fifteen_min_block
from t
order by datefield;

DATEFIELD           TIME_ FIFTEEN_MIN_BLOCK_SECS FIFTEEN_MIN_BLOCK 
------------------- ----- ---------------------- -------------------
2015-06-17 21:03:00 75780                  75600 2015-06-17 21:00:00
2015-06-18 05:07:28 18448                  18000 2015-06-18 05:00:00
2015-06-18 05:48:42 20922                  20700 2015-06-18 05:45:00
2015-06-18 07:23:03 26583                  26100 2015-06-18 07:15:00
2015-06-18 08:24:57 30297                  29700 2015-06-18 08:15:00
2015-06-18 08:52:06 31926                  31500 2015-06-18 08:45:00
2015-06-18 10:59:14 39554                  38700 2015-06-18 10:45:00
2015-06-18 11:47:05 42425                  42300 2015-06-18 11:45:00
2015-06-18 12:08:37 43717                  43200 2015-06-18 12:00:00
2015-06-18 17:07:23 61643                  61200 2015-06-18 17:00:00

So you'd need to have the

trunc(date_field)
  + (floor(to_number(to_char(date_field, 'SSSSS'))/900) * 900) / 86400

or the slightly simpler

trunc(date_field)
  + floor(to_number(to_char(date_field, 'SSSSS'))/900) / 96

part in your group by clause, and probably in your select list for display.

Assuming T2318.C3 is seconds since the epoch, you could manipulate that directly and then pass that to your secs_to_datetime function:

secs_to_datetime(floor(T2318.C3 / 900) * 900)

So the equivalent demo to the one above, again with ten randomly-generated times in a CTE, would be:

with T2318(c3) as (
  select 1434708000 - dbms_random.value(0, 80000) from dual
  connect by level <= 10
)
select to_char(secs_to_datetime(T2318.C3),'DD/MM/YYYY HH24:MI:SS') as datefield,
  T2318.C3 as time_secs,
  floor(T2318.C3/900) * 900 as fifteen_min_secs,
  to_char(secs_to_datetime(floor(T2318.C3 / 900) * 900),
    'DD/MM/YYYY HH24:MI:SS') as fifteen_min
from T2318
order by T2318.C3;

DATEFIELD              TIME_SECS FIFTEEN_MIN_SECS FIFTEEN_MIN       
------------------- ------------ ---------------- -------------------
18/06/2015 12:34:02   1434630842       1434630600 18/06/2015 12:30:00
18/06/2015 15:06:25   1434639985       1434639600 18/06/2015 15:00:00
18/06/2015 16:43:27   1434645807       1434645000 18/06/2015 16:30:00
18/06/2015 18:57:25   1434653845       1434653100 18/06/2015 18:45:00
18/06/2015 19:01:09   1434654069       1434654000 18/06/2015 19:00:00
18/06/2015 20:54:09   1434660849       1434660300 18/06/2015 20:45:00
19/06/2015 03:59:48   1434686388       1434685500 19/06/2015 03:45:00
19/06/2015 06:58:09   1434697089       1434696300 19/06/2015 06:45:00
19/06/2015 07:36:36   1434699396       1434699000 19/06/2015 07:30:00
19/06/2015 07:47:26   1434700046       1434699900 19/06/2015 07:45:00

Or if it's in milliseconds, divide and multiply by 900000.

Upvotes: 3

shawnt00
shawnt00

Reputation: 17915

In SQL when we talk about "grouping" we are most often talking about aggregating multiple rows together and summarizing the result. I get the impression that you just want to "round" time values down to the start of a 15-minute block. The math is pretty easy but you may still have a little work to get it to display he way you want it:

FLOOR(EXTRACT(MINUTE FROM datetime_column) / 15) * 15

or maybe:

'00:' || RIGHT('0' || TO_CHAR(FLOOR(EXTRACT(MINUTE FROM datetime_column) / 15) * 15), 2)

I'm not sure if you truly have a datetime column to work with but it's not much different against a string value in a known format.

FLOOR(TO_NUMBER(RIGHT(HORA_CRIACAO, 2)) / 15) * 15

I wanted to use integer division but I'm not quite sure how that's accomplished in Oracle. Many people are surprised by that behavior though so it's possible that using FLOOR() is more clear anyway.

Upvotes: 0

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