Totals for hour not summing

Question

Hello,
I have a query that is supposed to filling in missing values for individual hours of the date in the date range specified if there is nothing for that hour in the database.
It is also supposed to sum the totals for each hour. I have not been able to get my query to group by the hour. For example, I get
<br><br>
call_start_date     st_hour   inc_comp
06-NOV-06           00          0
06-NOV-06           01          0
06-NOV-06           02          1
06-NOV-06           02          1
06-NOV-06           02          0
06-NOV-06           02          1
06-NOV-06           03          0
06-NOV-06           04          0      ..and so on, up to hour 23 for the date, then it
continues with 07-NOV-07, etc.
What I should be getting is this:
call_start_date     st_hour   inc_comp
06-NOV-06           00          0
06-NOV-06           01          0
06-NOV-06           02          3
06-NOV-06           03          0
06-NOV-06           04          0      ..and so on, up to hour 23 for the date, then it
continues with 07-NOV-07, etc.
<BR>Code:
SELECT call_start_date, TO_CHAR(call_start_date,'HH24') st_hour,
       SUM(int_comp) inc_comp
FROM (
SELECT call_start_date,      
       sum( int_comp) int_comp
       FROM cdhtp.station_sum_view      
       WHERE call_start_date       
       BETWEEN TO_DATE(SUBSTR('06-NOV-2006 00:00',1,19),'DD-MON-YYYY HH24:MI')      
       AND to_date (substr ('07-NOV-2006 23:59',1,19),'DD-MON-YYYY HH24:MI')      
       AND switch_id = 'PABST'
       GROUP BY call_start_date
UNION
SELECT TO_DATE('06-NOV-2006', 'DD-MON-YYYY') + (LEVEL - 1) / 24 call_start_date, 0,0,0,0,0,0,0
FROM dual 
CONNECT BY LEVEL <= ((TO_DATE('07-NOV-2006','DD-MON-YYYY')+1) - TO_DATE('06-NOV-2006','DD-MON-YYYY')) * 24
MINUS
SELECT call_start_date, 0,0,0,0,0,0,0
       FROM cdhtp.station_sum_view      
       WHERE call_start_date       
       BETWEEN TO_DATE(SUBSTR('06-NOV-2006 00:00',1,19),'DD-MON-YYYY HH24:MI')      
       AND to_date (substr ('07-NOV-2006 23:59',1,19),'DD-MON-YYYY HH24:MI')      
       AND switch_id = 'PABST'  
)) GROUP BY call_start_date, TO_CHAR(call_start_date,'HH24') ;<br>
Thanks!
Laura

Answer 1

Is your problem this error?
ORA-01789: query block has incorrect number of result columnsIf so, you just need to remove those exra zeroes in the sub-query. the number of columns must be the same on either side of a UNION.
Given this data ...
SQL> alter session set nls_date_format = 'DD-MON-YYYY HH24';
Session altered.
SQL> select * from station_sum_view 
  2  /
CALL_START_DAT   INT_COMP SWITC
06-NOV-2006 00          0 PABST
06-NOV-2006 01          0 PABST
06-NOV-2006 02          1 PABST
06-NOV-2006 02          1 PABST
06-NOV-2006 02          0 PABST
06-NOV-2006 02          1 PABST
06-NOV-2006 03          0 PABST
06-NOV-2006 04          0 PABST
06-NOV-2006 07          0 PABST
06-NOV-2006 07          0 PABST
06-NOV-2006 07          0 PABST
06-NOV-2006 09          0 PABST
06-NOV-2006 09          1 PABST
13 rows selected.
SQL> I get this ...
SQL> SELECT call_start_date, TO_CHAR(call_start_date,'HH24') st_hour,
  2         SUM(int_comp) int_comp
  3  FROM (
  4  SELECT call_start_date,      
  5         sum( int_comp) int_comp
  6         FROM station_sum_view      
  7         WHERE call_start_date       
  8         BETWEEN TO_DATE(SUBSTR('06-NOV-2006 00:00',1,19),'DD-MON-YYYY HH24:MI')      
  9         AND to_date (substr ('07-NOV-2006 23:59',1,19),'DD-MON-YYYY HH24:MI')      
10         AND switch_id = 'PABST'
11         GROUP BY call_start_date
12  UNION
13  (
14  SELECT TO_DATE('06-NOV-2006', 'DD-MON-YYYY') + (LEVEL - 1) / 24 call_start_date, 0
15  FROM dual 
16  CONNECT BY LEVEL <= ((TO_DATE('07-NOV-2006','DD-MON-YYYY')+1) - TO_DATE('06-NOV-2006','DD-MON-YYYY')) * 24
17  MINUS
18  SELECT call_start_date, 0
19         FROM station_sum_view      
20         WHERE call_start_date       
21         BETWEEN TO_DATE(SUBSTR('06-NOV-2006 00:00',1,19),'DD-MON-YYYY HH24:MI')      
22         AND to_date (substr ('07-NOV-2006 23:59',1,19),'DD-MON-YYYY HH24:MI')      
23         AND switch_id = 'PABST'  
24  )) GROUP BY call_start_date, TO_CHAR(call_start_date,'HH24') ;
CALL_START_DAT ST   INT_COMP
06-NOV-2006 00 00          0
06-NOV-2006 01 01          0
06-NOV-2006 02 02          3
06-NOV-2006 03 03          0
06-NOV-2006 04 04          0
06-NOV-2006 05 05          0
06-NOV-2006 06 06          0
06-NOV-2006 07 07          0
06-NOV-2006 08 08          0
06-NOV-2006 09 09          1
06-NOV-2006 10 10          0
06-NOV-2006 11 11          0
06-NOV-2006 12 12          0
.....Cheers, APC