Rank Erhöhung nur für die Änderung in Zeile Wert

Question

Ich habe psql Rang und Partition Funktionen zum Erstellen einer Tabelle, die die Reihenfolge der Fotos auf einer Reise, ID ist die Bild-ID, NSID ist der Fotograf ID, Standort ist wo das Foto gemacht wurde, und Rang ist die Reihenfolge, in der die Fotos während der Reise aufgenommen wurden (definiert durch Fotos in derselben date_trunc-Zeitperiode).

id |nsid   |location |date_taken |time_taken |date_trunc |rank 
1 |10000137@N04 |11   |08/03/2006 |18:42:02 |2006-03-06 |1  
2 |10000137@N04 |11   |08/03/2006 |18:56:44 |2006-03-06 |2  
3 |10000137@N04 |446  |12/09/2007 |01:05:27 |2007-09-10 |1  
4 |10000137@N04 |4   |12/09/2007 |01:05:35 |2007-09-10 |2  
5 |10000137@N04 |4   |12/09/2007 |01:05:41 |2007-09-10 |3  
6 |10000137@N04 |56   |12/09/2007 |01:05:45 |2007-09-10 |4  
7 |10000137@N04 |11   |03/07/2008 |09:21:54 |2008-06-30 |1  
8 |10000137@N04 |3199  |09/03/2013 |16:37:40 |2013-03-04 |1  
9 |10000137@N04 |4   |09/03/2013 |18:56:55 |2013-03-04 |2  
10 |10000280@N07 |215  |02/08/2007 |17:25:43 |2007-07-30 |1  
11 |10000280@N07 |215  |03/08/2007 |19:35:11 |2007-07-30 |2  
12 |100006043@N02 |203  |05/08/2013 |14:02:49 |2013-07-29 |1  
13 |100006043@N02 |1   |05/08/2013 |18:08:45 |2013-07-29 |2  
14 |100010324@N02 |1   |14/04/2013 |19:19:13 |2013-04-08 |1  
15 |100010343@N03 |367  |04/06/2014 |18:54:13 |2014-06-02 |1  
16 |100014982@N03 |2909  |28/08/2013 |23:20:27 |2013-08-26 |1  
17 |100014982@N03 |183  |13/09/2013 |12:26:41 |2013-09-09 |1  
18 |100018928@N06 |1149  |01/08/2013 |08:40:22 |2013-07-29 |1  
19 |100018928@N06 |1149  |01/08/2013 |08:40:23 |2013-07-29 |2  
20 |100018928@N06 |1149  |01/08/2013 |08:40:32 |2013-07-29 |3  
21 |100018928@N06 |1149  |01/08/2013 |08:40:33 |2013-07-29 |4  
22 |100021169@N02 |10   |02/07/2005 |18:17:26 |2005-06-27 |1  
23 |100021169@N02 |10   |02/07/2005 |18:18:13 |2005-06-27 |2 

Ich möchte eine neue Spalte erstellen die Position in der Reihenfolge genannt location_rank, die in dem der Standort besucht wurde. Fotos, die von demselben Benutzer auf derselben Reise am selben Ort aufgenommen wurden, hätten denselben location_rank, und der Wert location_rank würde nur für jeden neuen Standort während der Reise dieses Benutzers erhöht (dh nur wenn sich der Standortwert von der vorherigen Zeile ändert) in der Partition). So würde die gewünschte Tabelle wie folgt aussehen:

id |nsid   |location |date_taken|time_taken|date_trunc |rank|location_rank 
1 |10000137@N04 |11  |08/03/06 |18:42:02 |2006-01-01 |1 |1 
2 |10000137@N04 |11  |08/03/06 |18:56:44 |2006-01-01 |2 |1 
3 |10000137@N04 |446  |12/09/07 |01:05:27 |2007-01-01 |1 |1 
4 |10000137@N04 |4  |12/09/07 |01:05:35 |2007-01-01 |2 |2 
5 |10000137@N04 |4  |12/09/07 |01:05:41 |2007-01-01 |3 |2 
6 |10000137@N04 |56  |12/09/07 |01:05:45 |2007-01-01 |4 |3 
7 |10000137@N04 |11  |03/07/08 |09:21:54 |2008-01-01 |1 |1 
8 |10000137@N04 |3199  |09/03/13 |16:37:40 |2013-01-01 |1 |1 
9 |10000137@N04 |4  |09/03/13 |18:56:55 |2013-01-01 |2 |2 
10 |10000280@N07 |215  |02/08/07 |17:25:43 |2007-01-01 |1 |1 
11 |10000280@N07 |215  |03/08/07 |19:35:11 |2007-01-01 |2 |1 
12 |100006043@N02 |203  |05/08/13 |14:02:49 |2013-01-01 |1 |1 
13 |100006043@N02 |1  |05/08/13 |18:08:45 |2013-01-01 |2 |2 
14 |100010324@N02 |1  |14/04/13 |19:19:13 |2013-01-01 |1 |1 
15 |100010343@N03 |367  |04/06/14 |18:54:13 |2014-01-01 |1 |1 
16 |100014982@N03 |2909  |28/08/13 |23:20:27 |2013-01-01 |1 |1 
17 |100014982@N03 |183  |13/09/13 |12:26:41 |2013-01-01 |2 |2 
18 |100018928@N06 |1149  |01/08/13 |08:40:22 |2013-01-01 |1 |1 
19 |100018928@N06 |1149  |01/08/13 |08:40:23 |2013-01-01 |2 |1 
20 |100018928@N06 |1149  |01/08/13 |08:40:32 |2013-01-01 |3 |1 
21 |100018928@N06 |1149  |01/08/13 |08:40:33 |2013-01-01 |4 |1 
22 |100021169@N02 |10  |02/07/05 |18:17:26 |2005-01-01 |1 |1 
23 |100021169@N02 |10  |02/07/05 |18:18:13 |2005-01-01 |2 |1 
24 |10002296@N02 |25  |12/03/11 |13:41:10 |2011-01-01 |1 |1 
25 |10002296@N02 |25  |12/03/11 |13:42:19 |2011-01-01 |2 |1 
26 |10002296@N02 |25  |12/03/11 |14:00:49 |2011-01-01 |3 |1 
27 |10002296@N02 |25  |12/03/11 |14:07:57 |2011-01-01 |4 |1 
28 |10002296@N02 |25  |12/03/11 |14:10:12 |2011-01-01 |5 |1 
29 |10002450@N05 |105  |07/08/11 |02:43:45 |2011-01-01 |1 |1 
30 |10002450@N05 |5  |07/08/11 |05:19:27 |2011-01-01 |2 |2 
31 |100025689@N07 |966  |28/10/13 |20:19:05 |2013-01-01 |1 |1 
32 |100025689@N07 |966  |28/10/13 |20:35:38 |2013-01-01 |2 |1 
33 |100025689@N07 |966  |28/10/13 |20:35:55 |2013-01-01 |3 |1 
34 |100025689@N07 |966  |28/10/13 |21:09:53 |2013-01-01 |4 |1 
35 |100025689@N07 |966  |28/10/13 |21:27:50 |2013-01-01 |5 |1 
36 |100029993@N07 |831  |27/09/14 |18:27:24 |2014-01-01 |1 |1 
37 |100029993@N07 |3708  |09/10/14 |20:36:42 |2014-01-01 |2 |2 
38 |100033343@N05 |42  |31/10/14 |12:23:50 |2014-01-01 |1 |1 
39 |10003453@N03 |16  |28/08/09 |13:46:44 |2009-01-01 |1 |1 
40 |10003453@N03 |186  |28/08/09 |14:17:39 |2009-01-01 |2 |2 
41 |10003453@N03 |19  |28/08/09 |16:43:07 |2009-01-01 |3 |3 
42 |10003453@N03 |2919  |29/08/09 |12:18:10 |2009-01-01 |4 |4 
43 |10003453@N03 |2453  |29/08/09 |13:22:12 |2009-01-01 |5 |5 
44 |10003453@N03 |262  |29/08/09 |15:59:14 |2009-01-01 |6 |6 
45 |10003453@N03 |22  |30/08/09 |15:26:56 |2009-01-01 |7 |7 
46 |10003453@N03 |33  |30/08/09 |16:25:30 |2009-01-01 |8 |8 
47 |10003453@N03 |2914  |30/08/09 |21:29:39 |2009-01-01 |9 |9 
48 |10003453@N03 |408  |03/09/09 |23:36:12 |2009-01-01 |10 |10 
49 |10003453@N03 |133  |06/09/09 |21:57:03 |2009-01-01 |11 |11 
50 |10003453@N03 |713  |16/09/09 |00:01:53 |2009-01-01 |12 |12 

Ich habe versucht, die DENSE_RANK-Funktion, aber ich habe nicht erfolgreich gewesen. Ich wäre sehr dankbar für Hilfe bei der Erstellung der Spalte location_rank. Hier

ist die DENSE_RANK Abfrage, die ich versucht habe unsuccesfully:

create table prep.location_rank2 as 
select 
    id, nsid, 
    location,date_taken,time_taken,date_trunc, rank, 
    dense_rank() over(
     partition by nsid, date_trunc 
     order by date_taken, time_taken, location, rank 
    ) as location_rank 
from prep.test 
order by nsid; 

Answer 1

SELECT id, 
     nsid, 
     location, 
     date_taken, 
     time_taken, 
     date_trunc, 
     [rank], 
     DENSE_RANK() OVER (PARTITION BY nsid, date_trunc 
           ORDER BY CASE WHEN [rank] = rnum 
              THEN location 
              ELSE CAST(CONCAT(CAST([rank]-rnum AS VARCHAR), CAST(location AS VARCHAR)) AS INT) 
             END) location_rank 
    FROM (SELECT *, 
       ROW_NUMBER() OVER (PARTITION BY nsid, date_trunc 
             ORDER BY location) rnum 
      FROM photo_trip 
     ) a 
ORDER BY id; 

Ergebnis

id nsid   location date_taken time_taken   date_trunc rank location_rank 
1 10000137@N04 11   2006-03-08 18:42:02.0000000 2006-03-06 1  1 
2 10000137@N04 11   2006-03-08 18:56:44.0000000 2006-03-06 2  1 
3 10000137@N04 446   2007-09-12 01:05:27.0000000 2007-09-10 1  1 
4 10000137@N04 4   2007-09-12 01:05:35.0000000 2007-09-10 2  2 
5 10000137@N04 4   2007-09-12 01:05:41.0000000 2007-09-10 3  2 
6 10000137@N04 56   2007-09-12 01:05:45.0000000 2007-09-10 4  3 
7 10000137@N04 11   2008-07-03 09:21:54.0000000 2008-06-30 1  1 
8 10000137@N04 3199  2013-03-09 16:37:40.0000000 2013-03-04 1  1 
9 10000137@N04 4   2013-03-09 18:56:55.0000000 2013-03-04 2  2 
10 10000280@N07 215   2007-08-02 17:25:43.0000000 2007-07-30 1  1 
11 10000280@N07 215   2007-08-03 19:35:11.0000000 2007-07-30 2  1 
12 100006043@N02 203   2013-08-05 14:02:49.0000000 2013-07-29 1  1 
13 100006043@N02 1   2013-08-05 18:08:45.0000000 2013-07-29 2  2 
14 100010324@N02 1   2013-04-14 19:19:13.0000000 2013-04-08 1  1 
15 100010343@N03 367   2014-06-04 18:54:13.0000000 2014-06-02 1  1 
16 100014982@N03 2909  2013-08-28 23:20:27.0000000 2013-08-26 1  1 
17 100014982@N03 183   2013-09-13 12:26:41.0000000 2013-09-09 1  1 
18 100018928@N06 1149  2013-08-01 08:40:22.0000000 2013-07-29 1  1 
19 100018928@N06 1149  2013-08-01 08:40:23.0000000 2013-07-29 2  1 
20 100018928@N06 1149  2013-08-01 08:40:32.0000000 2013-07-29 3  1 
21 100018928@N06 1149  2013-08-01 08:40:33.0000000 2013-07-29 4  1 
22 100021169@N02 10   2005-07-02 18:17:26.0000000 2005-06-27 1  1 
23 100021169@N02 10   2005-07-02 18:18:13.0000000 2005-06-27 2  1