The closest point of all in a table

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• Help: SQL to select the closest points within groups of documents grouped by hour

  Hello
  I need help to find a SQL for an effective solution to the following problem:
  -J' have 20 buses circling on a bus line and their locations are reported every 10 seconds and recorded in a table space 'bus_location' with 'bus_loc' as the SDO_GEOMETRY type.
  -Location of bus each record there is a column msg_datetime with the time when the position has been saved.
  -Bus circle the the bus route 8 to 12 times, from A to B, then b back to A, then new loop from A to B and so on.
  -J' have 3 points of synchronization in the spatial table "timing_point" with "tp_loc" as the SDO_GEOMETRY type.
  -A bus will pass each timing point 8 - 12 times in one direction and 8 - 12 times the other way, while making the loops on the road to the bus.
  
  My task is: for each timing point, every bus, (A - B or B - bis), find nearest bus for each direction of travel place to this timing point.
  
  Example:
  Bus... * TimingPoint *... * time *... * Distance *.
  ...........................................*between*
  ...........................................*bus and TP*
  12......A................ 14:01, 250 m
  12......A................ 14:01:10... 150 m
  12......A................ 14:01:20... 12 m < == it is closest to the TP for this pass
  12......A................ 14:01:30, 48 m
  12......A................ 14:01:40... 100 m
  12......A................ 14:01:50... 248 m
  12......A................ 14:29:40, 122 m
  12......A................ 14:29:50, 72 m
  12......A................ 14:30... 9 m < == it is closest to the TP for this pass
  12......A................ 14:30:10... 10 m
  12......A................ 14:30:20... 12 m
  
  I tried to use SDO_NN, and I just can't close bus locations, but how do I find the location of bus closest to each passage? Or how to identify a location of bus groups who are together in 2-3 minutes and find the record closest to each of these groups of locations?
  I thank very you much for any help.
  
  Milan
  
  Published by: mburazor on February 9, 2012 14:41

  Milan,

  Yes, the problem is one of the non-space analytical. Here's another GB, which should be independent of the year/month/date/hour/minute
  as it does all its math based on an absolute number of minutes since 1970. I turn to 5 minutes but you could round/trunc at all
  interval (5 minutes, 10 minutes, 15 minutes, etc.)

  Note that I have created additional folders in the same table I built. (Tip: good idea to provide an example of dataset on the forum when)
  ask tough questions of SQL like this).

  drop table buslocns;
  
  create table buslocns(
  busno number,
  timingpt varchar2(1),
  pttime   timestamp,
  distance number)
  ;
  insert into buslocns values (12,'A',to_timestamp('2012/02/10 14:01:00','YYYY/MM/DD HH24:MI:SS'),250);
  insert into buslocns values (12,'A',to_timestamp('2012/02/10 14:01:10','YYYY/MM/DD HH24:MI:SS'),150);
  insert into buslocns values (12,'A',to_timestamp('2012/02/10 14:01:20','YYYY/MM/DD HH24:MI:SS'),12);
  insert into buslocns values (12,'A',to_timestamp('2012/02/10 14:01:30','YYYY/MM/DD HH24:MI:SS'),48);
  insert into buslocns values (12,'A',to_timestamp('2012/02/10 14:01:40','YYYY/MM/DD HH24:MI:SS'),100);
  insert into buslocns values (12,'A',to_timestamp('2012/02/10 14:01:50','YYYY/MM/DD HH24:MI:SS'),248);
  insert into buslocns values (12,'A',to_timestamp('2012/02/10 14:29:40','YYYY/MM/DD HH24:MI:SS'),122);
  insert into buslocns values (12,'A',to_timestamp('2012/02/10 14:29:50','YYYY/MM/DD HH24:MI:SS'),72);
  insert into buslocns values (12,'A',to_timestamp('2012/02/10 14:30:00','YYYY/MM/DD HH24:MI:SS'),9);
  insert into buslocns values (12,'A',to_timestamp('2012/02/10 14:30:10','YYYY/MM/DD HH24:MI:SS'),10);
  insert into buslocns values (12,'A',to_timestamp('2012/02/10 14:30:20','YYYY/MM/DD HH24:MI:SS'),12);
  
  insert into buslocns values (12,'A',to_timestamp('2012/02/10 14:59:40','YYYY/MM/DD HH24:MI:SS'),53);
  insert into buslocns values (12,'A',to_timestamp('2012/02/10 14:59:50','YYYY/MM/DD HH24:MI:SS'),28);
  insert into buslocns values (12,'A',to_timestamp('2012/02/10 15:00:00','YYYY/MM/DD HH24:MI:SS'),12);
  insert into buslocns values (12,'A',to_timestamp('2012/02/10 15:00:10','YYYY/MM/DD HH24:MI:SS'),73);
  insert into buslocns values (12,'A',to_timestamp('2012/02/10 14:44:40','YYYY/MM/DD HH24:MI:SS'),53);
  insert into buslocns values (12,'A',to_timestamp('2012/02/10 14:44:50','YYYY/MM/DD HH24:MI:SS'),28);
  insert into buslocns values (12,'A',to_timestamp('2012/02/10 15:45:00','YYYY/MM/DD HH24:MI:SS'),12);
  insert into buslocns values (12,'A',to_timestamp('2012/02/10 15:45:10','YYYY/MM/DD HH24:MI:SS'),73);
  
  commit;
  with tensOfMinutes as (
  select row_number() over (order by busno,timingpt, pttime) as rid,
         busno,
         timingpt,
         pttime,
         round(((cast(pttime as date) - cast('01-JAN-1970' as date)) * 1440) / 5) * 5 as mins,
         distance
    from BUSLOCNS
  )
  select busno,timingpt,to_char(to_date('01-JAN-1970','DD-MON-YYYY') + ( mins / 1440 ),'DD-MON-YYYY HH24:MI:SS') as pttime,minDist
    from (select busno,timingpt,mins,min(distance) as minDist
            from tensOfMinutes a
           group by a.busno, a.timingpt, a.mins
           order by 1, 2, 3 ) ;
  -- Result
  --
  BUSNO                  TIMINGPT PTTIME               MINDIST
  ---------------------- -------- -------------------- ----------------------
  12                     A        10-FEB-2012 14:00:00 12
  12                     A        10-FEB-2012 14:30:00 9
  12                     A        10-FEB-2012 14:45:00 28
  12                     A        10-FEB-2012 15:00:00 12
  12                     A        10-FEB-2012 15:45:00 12
  

  concerning
  Simon

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  Your question would be better suited for the TechNet forums.

  I suggest you to ask your question to the TechNet forum for better support.

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  Popup LOV 2 named P33_LOCATIONS was the following: Europe, America, Asia, Africa, ecc.

  
  

  Popup LOV 3 named P33_DEVICES has the following: printer, keyboard, mouse, monitor, ecc.

  
  

  If I query the table to return the lines according to the selected in these LOVs I have something like this:

  
  

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  SELECT *
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