Slice time according to groups

Question

Hello,
I have oracle 9i DB, I have to divide time according to below time span
From Month To Month EstLoad FromTime ToTime
5     8     5     02:00     13:00
5     8     20     13:01     17:00
the above data is stored in Table I want to calculate the EstLoad based on above time span for instance I have interruption which starts at 12:45 and End at 13:30 so in this case we have two slices 12:45 - 13:00 and 13:01 - 13:30, I want to write a query for this slicing of time is it possible with query because I don't want to hard code start and end time in report I want to pass it from table.
Thanks and Regards, Khawar.

Answer 1

Hi Dear,
It works great, although this query looks simple but still I am trying to understand how it works, Thanks again.
Regards, Khawar.
Hi Rob,
I found this query does not works some time as expected I tried to fix it but no success
just take a look at table EST_LOAD
CREATE TABLE EST_LOAD
  FROM_MONTH     NUMBER,
  TO_MONTH       NUMBER,
  LOAD_KW        NUMBER                         DEFAULT 0,
  FROM_TIME      VARCHAR2(20 BYTE),
  TO_TIME        VARCHAR2(20 BYTE),
  DISTRICT_CODE  VARCHAR2(10 BYTE)
ALTER TABLE EST_LOAD ADD (
  CONSTRAINT EST_LOAD_PK
PRIMARY KEY
(FROM_MONTH, TO_MONTH, FROM_TIME, TO_TIME, DISTRICT_CODE)data for table t is
Insert into EST_LOAD  (FROM_MONTH, TO_MONTH, LOAD_KW, FROM_TIME, TO_TIME,     DISTRICT_CODE)
Values  (10, 12, 0.8, '00:00', '23:59',     'BBALI');
Insert into EST_LOAD   (FROM_MONTH, TO_MONTH, LOAD_KW, FROM_TIME, TO_TIME,     DISTRICT_CODE)
Values   (5, 9, 0.8, '17:01', '22:00',     'BBALI');
Insert into EST_LOAD   (FROM_MONTH, TO_MONTH, LOAD_KW, FROM_TIME, TO_TIME,     DISTRICT_CODE)
Values   (5, 9, 0.8, '02:01', '13:00',     'BBALI');
Insert into EST_LOAD   (FROM_MONTH, TO_MONTH, LOAD_KW, FROM_TIME, TO_TIME,     DISTRICT_CODE)
Values   (5, 9, 1.6, '00:00', '02:00',     'BBALI');
Insert into EST_LOAD   (FROM_MONTH, TO_MONTH, LOAD_KW, FROM_TIME, TO_TIME,     DISTRICT_CODE)
Values   (5, 9, 1.6, '22:00', '23:59',     'BBALI');
Insert into EST_LOAD   (FROM_MONTH, TO_MONTH, LOAD_KW, FROM_TIME, TO_TIME,     DISTRICT_CODE)
Values   (8, 9, 2.4, '13:01', '17:00',     'BBALI');
Insert into EST_LOAD   (FROM_MONTH, TO_MONTH, LOAD_KW, FROM_TIME, TO_TIME,     DISTRICT_CODE)
Values   (5, 7, 3.2, '13:01', '17:00',     'BBALI');
Insert into EST_LOAD   (FROM_MONTH, TO_MONTH, LOAD_KW, FROM_TIME, TO_TIME,     DISTRICT_CODE)
Values   (1, 4, 0.8, '00:00', '23:59',     'BBALI');create table INTERP_DETAIL stmt
CREATE TABLE INTERP_DETAIL
  REF_NO         NUMBER(5)                      NOT NULL,
  INC_TYPE_CODE  VARCHAR2(2 BYTE)               NOT NULL,
  FEEDER_CODE    VARCHAR2(8 BYTE)               NOT NULL,
  VOL_LEVEL      VARCHAR2(3 BYTE),
  START_DT_TIME  DATE,
  GRID_CODE      VARCHAR2(3 BYTE)               NOT NULL,
  END_DT_TIME    DATE,
  LOAD_AMP       NUMBER(10,3)
ALTER TABLE INTERP_DETAIL ADD (
  CONSTRAINT INTERP_DETAIL_PK
PRIMARY KEY
(REF_NO, INC_TYPE_CODE, GRID_CODE, FEEDER_CODE, START_DT_TIME, END_DT_TIME)data for INTERP_DETAIL table
Insert into INTERP_DETAIL
   (REF_NO, INC_TYPE_CODE, FEEDER_CODE, VOL_LEVEL, START_DT_TIME,     GRID_CODE, END_DT_TIME, LOAD_AMP)
Values   (2116, 'UN', 'RUSG11L5', '33', TO_DATE('09/09/2008 23:43:00', 'MM/DD/YYYY HH24:MI:SS'),     'RUS', TO_DATE('09/10/2008 01:04:00', 'MM/DD/YYYY HH24:MI:SS'), 14);
Insert into INTERP_DETAIL   (REF_NO, INC_TYPE_CODE, FEEDER_CODE, VOL_LEVEL, START_DT_TIME,     GRID_CODE, END_DT_TIME, LOAD_AMP)
Values   (2116, 'UN', 'RUSG9L5', '33', TO_DATE('09/09/2008 23:43:00', 'MM/DD/YYYY HH24:MI:SS'),     'RUS', TO_DATE('09/10/2008 00:22:00', 'MM/DD/YYYY HH24:MI:SS'), 154);
Insert into INTERP_DETAIL   (REF_NO, INC_TYPE_CODE, FEEDER_CODE, VOL_LEVEL, START_DT_TIME,     GRID_CODE, END_DT_TIME, LOAD_AMP)
Values   (2116, 'UN', 'RUSG7L5', '33', TO_DATE('09/09/2008 23:43:00', 'MM/DD/YYYY HH24:MI:SS'),     'RUS', TO_DATE('09/10/2008 00:22:00', 'MM/DD/YYYY HH24:MI:SS'), 67);
Insert into INTERP_DETAIL   (REF_NO, INC_TYPE_CODE, FEEDER_CODE, VOL_LEVEL, START_DT_TIME,     GRID_CODE, END_DT_TIME, LOAD_AMP)
Values   (2116, 'UN', 'RUSG5L5', '33', TO_DATE('09/09/2008 23:43:00', 'MM/DD/YYYY HH24:MI:SS'),     'RUS', TO_DATE('09/10/2008 00:22:00', 'MM/DD/YYYY HH24:MI:SS'), 78);
Insert into INTERP_DETAIL   (REF_NO, INC_TYPE_CODE, FEEDER_CODE, VOL_LEVEL, START_DT_TIME,     GRID_CODE, END_DT_TIME, LOAD_AMP)
Values   (2116, 'UN', 'RUSG3L5', '33', TO_DATE('09/09/2008 23:43:00', 'MM/DD/YYYY HH24:MI:SS'),     'RUS', TO_DATE('09/10/2008 00:22:00', 'MM/DD/YYYY HH24:MI:SS'), 95);
Insert into INTERP_DETAIL   (REF_NO, INC_TYPE_CODE, FEEDER_CODE, VOL_LEVEL, START_DT_TIME,     GRID_CODE, END_DT_TIME, LOAD_AMP)
Values   (2116, 'UN', 'RUSG1L5', '33', TO_DATE('09/09/2008 23:43:00', 'MM/DD/YYYY HH24:MI:SS'),     'RUS', TO_DATE('09/10/2008 00:22:00', 'MM/DD/YYYY HH24:MI:SS'), 49);
Insert into INTERP_DETAIL   (REF_NO, INC_TYPE_CODE, FEEDER_CODE, VOL_LEVEL, START_DT_TIME,     GRID_CODE, END_DT_TIME, LOAD_AMP)
Values   (2116, 'UN', 'RUSG12L5', '33', TO_DATE('09/09/2008 23:43:00', 'MM/DD/YYYY HH24:MI:SS'),     'RUS', TO_DATE('09/10/2008 00:22:00', 'MM/DD/YYYY HH24:MI:SS'), 51);
Insert into INTERP_DETAIL   (REF_NO, INC_TYPE_CODE, FEEDER_CODE, VOL_LEVEL, START_DT_TIME,     GRID_CODE, END_DT_TIME, LOAD_AMP)
Values   (2116, 'UN', 'RUSG10L5', '33', TO_DATE('09/09/2008 23:43:00', 'MM/DD/YYYY HH24:MI:SS'),     'RUS', TO_DATE('09/10/2008 00:22:00', 'MM/DD/YYYY HH24:MI:SS'), 84);
Insert into INTERP_DETAIL   (REF_NO, INC_TYPE_CODE, FEEDER_CODE, VOL_LEVEL, START_DT_TIME,     GRID_CODE, END_DT_TIME, LOAD_AMP)
Values   (2116, 'UN', 'RUSG8L5', '33', TO_DATE('09/09/2008 23:43:00', 'MM/DD/YYYY HH24:MI:SS'),     'RUS', TO_DATE('09/10/2008 00:23:00', 'MM/DD/YYYY HH24:MI:SS'), 72);
Insert into INTERP_DETAIL   (REF_NO, INC_TYPE_CODE, FEEDER_CODE, VOL_LEVEL, START_DT_TIME,     GRID_CODE, END_DT_TIME, LOAD_AMP)
Values   (2116, 'UN', 'RUSG6L5', '33', TO_DATE('09/09/2008 23:43:00', 'MM/DD/YYYY HH24:MI:SS'),     'RUS', TO_DATE('09/10/2008 00:23:00', 'MM/DD/YYYY HH24:MI:SS'), 51);
Insert into INTERP_DETAIL   (REF_NO, INC_TYPE_CODE, FEEDER_CODE, VOL_LEVEL, START_DT_TIME,     GRID_CODE, END_DT_TIME, LOAD_AMP)
Values   (2116, 'UN', 'RUSG4L5', '33', TO_DATE('09/09/2008 23:43:00', 'MM/DD/YYYY HH24:MI:SS'),     'RUS', TO_DATE('09/10/2008 00:23:00', 'MM/DD/YYYY HH24:MI:SS'), 159);
Insert into INTERP_DETAIL   (REF_NO, INC_TYPE_CODE, FEEDER_CODE, VOL_LEVEL, START_DT_TIME,     GRID_CODE, END_DT_TIME, LOAD_AMP)
Values   (2116, 'UN', 'RUSG2L5', '33', TO_DATE('09/09/2008 23:43:00', 'MM/DD/YYYY HH24:MI:SS'),     'RUS', TO_DATE('09/10/2008 00:23:00', 'MM/DD/YYYY HH24:MI:SS'), 160);
Insert into INTERP_DETAIL   (REF_NO, INC_TYPE_CODE, FEEDER_CODE, VOL_LEVEL, START_DT_TIME,     GRID_CODE, END_DT_TIME, LOAD_AMP)
Values   (2116, 'UN', 'RUSG2L5', '33', TO_DATE('09/10/2008 00:26:00', 'MM/DD/YYYY HH24:MI:SS'),     'RUS', TO_DATE('09/10/2008 00:55:00', 'MM/DD/YYYY HH24:MI:SS'), 160);
Insert into INTERP_DETAIL   (REF_NO, INC_TYPE_CODE, FEEDER_CODE, VOL_LEVEL, START_DT_TIME,     GRID_CODE, END_DT_TIME, LOAD_AMP)
Values   (2116, 'UN', 'RUSG10L5', '33', TO_DATE('09/10/2008 00:27:00', 'MM/DD/YYYY HH24:MI:SS'),     'RUS', TO_DATE('09/10/2008 00:55:00', 'MM/DD/YYYY HH24:MI:SS'), 84);
Insert into INTERP_DETAIL   (REF_NO, INC_TYPE_CODE, FEEDER_CODE, VOL_LEVEL, START_DT_TIME,     GRID_CODE, END_DT_TIME, LOAD_AMP)
Values   (2116, 'UN', 'RUSG29L5', '11', TO_DATE('09/09/2008 23:43:00', 'MM/DD/YYYY HH24:MI:SS'),     'RUS', TO_DATE('09/10/2008 01:04:00', 'MM/DD/YYYY HH24:MI:SS'), 26);
Insert into INTERP_DETAIL   (REF_NO, INC_TYPE_CODE, FEEDER_CODE, VOL_LEVEL, START_DT_TIME,     GRID_CODE, END_DT_TIME, LOAD_AMP)
Values   (2116, 'UN', 'RUSG30L5', '11', TO_DATE('09/09/2008 23:43:00', 'MM/DD/YYYY HH24:MI:SS'),     'RUS', TO_DATE('09/10/2008 01:04:00', 'MM/DD/YYYY HH24:MI:SS'), 120);Query to fetch data is
select round (case id.VOL_LEVEL --CALCULATING LOAD IN INTERUPPTION DETAIL DIVIDED ACCORDING TO TIME SLICES
                when '33' then
                      (id.LOAD_AMP/20)
                when '11' then
                      (id.LOAD_AMP/60)
               end * 1000 / E.LOAD_KW
             ) AS Effected_Customers
    , (  to_date(to_char( id.END_DT_TIME,'dd/mm/rrrr')||least(e.TO_TIME,to_char( id.END_DT_TIME,'hh24:mi')), 'dd/mm/rrrr hh24:mi')
       - to_date(to_char(id.START_DT_TIME, 'dd/mm/rrrr')||greatest(e.FROM_TIME, to_char(id.START_DT_TIME,'hh24:mi')), 'dd/mm/rrrr hh24:mi') ) * 24 * 60 as duration
    , e.load_kw as estimated_Load_Per_Customer
    , to_date(to_char(id.START_DT_TIME, 'dd/mm/rrrr')||greatest(e.FROM_TIME, to_char(id.START_DT_TIME,'hh24:mi')), 'dd/mm/rrrr hh24:mi') as  intstartTime
    , to_date(to_char( id.END_DT_TIME,'dd/mm/rrrr')||least(e.TO_TIME,to_char( id.END_DT_TIME,'hh24:mi')), 'dd/mm/rrrr hh24:mi') as  intendTime
    , i.INC_TYPE_CODE, i.REF_NO, e.TO_TIME, id.FEEDER_CODE
from  est_load e, interp_detail id, incident i, region_district rd
where e.DISTRICT_CODE = i.DISTRICT_CODE
and   i.REF_NO = id.REF_NO
and   i.INC_TYPE_CODE = id.INC_TYPE_CODE
and   i.DISTRICT_CODE = rd.DISTRICT_CODE
and   to_date(to_char(id.START_DT_TIME,'rrrrmm'),'rrrrmm') >= to_date(to_char(id.END_DT_TIME,'rrrr') || lpad(e.FROM_MONTH,2,'0'),'rrrrmm')  
and   to_date(to_char(id.END_DT_TIME,'rrrrmm'),'rrrrmm')   <= to_date(to_char(id.START_DT_TIME,'rrrr') || lpad(e.TO_MONTH,2,'0'),'rrrrmm')
and   to_char(id.START_DT_TIME,'hh24:mi') <  e.TO_TIME
and   to_char(id.END_DT_TIME,'hh24:mi')   >  e.FROM_TIME
and   i.INC_TYPE_CODE = 'UN' and i.REF_NO = 2116 but the problem here is query returns only 2 rows it supposed to return more then 16 rows, will you plz take a look.
Thanks and regards, Khawar
Edited by: S. Khawar on Apr 5, 2009 10:03 AM
Edited by: S. Khawar on Apr 5, 2009 8:11 PM