Please help with a query were struggling with.

Question

Any help please, were struggling to get the result we require.
We have Scheduled data returned from another program(job table). Shows our jobs 1 through 9 and the time that each job is loaded on a machine.
i.e. if you look at the job table, job 1 is using machine 1 between 01-01-08 08:00 and 10-01-08 10:00.
We then have a calendar table that shows our hours the machine is able to work.
So machine 1 is available between 9-5.30 mon-fri but is not available on sat and Sunday.
What we need to do is produce a graph that shows the time per day each machine is loaded.
So if you see the result at the bottom, were hoping for something similar which shows for each machine, every day it is loaded and for how many hours.
Thanks in advance
Job TABLE with 4 columns
JOB NUMBER
MCR NUMBER
START DATE
FINISH DATE
1,1,01-01-08 08:00, 10-01-08 10:00
2,1,02-01-08 08:00, 03-01-08 10:00
3,1,04-01-08 08:00, 04-01-08 10:00
4,1,26-01-08 08:00, 26-01-08 10:00
5,1,19-01-08 08:00, 26-01-08 10:00
6,1,20-01-08 08:00, 21-01-08 10:00
7,2,01-01-08 08:00, 10-01-08 10:00
8,2,02-01-08 08:00, 03-01-08 10:00
9,2,05-01-08 08:00, 06-01-08 10:00
Calender TABLE WITH 3 COLUMNS
MCR     NUMBER
START     DATE
END     DATE
1,MON 09-30, MON 17-30
1,TUE 09-30, MON 17-30
1,WED 09-30, MON 17-30
1,THU 09-30, MON 17-30
1,FRI 09-30, MON 17-30
1,SAT 00-00, MON 00-00
1,SUN 00-00, MON 00-00
RESULT
MCR
DATE IN USE
HOURS IN USE
1,01-01-08,8
1,02-01-08,16
1,03-01-08,16
1,04-01-08,10
1,05-01-08,0
1,06-01-08,0
etc
Obviously these are not real figures but hopefully you get the idea!

Answer 1

Thanks Keith.
SQL> create table job_table
  2  as
  3  (
  4  select 1 machine_id,to_date('01-01-08 08:00','dd-mm-yy hh24:mi') started, to_date('10-01-08 10:00','dd-mm-yy hh24:mi') finished fr
om dual union all
  5  select 1,to_date('02-01-08 08:00','dd-mm-yy hh24:mi'), to_date('03-01-08 10:00','dd-mm-yy hh24:mi') from dual union all
  6  select 1,to_date('04-01-08 08:00','dd-mm-yy hh24:mi'), to_date('04-01-08 10:00','dd-mm-yy hh24:mi') from dual union all
  7  select 1,to_date('26-01-08 08:00','dd-mm-yy hh24:mi'), to_date('26-01-08 10:00','dd-mm-yy hh24:mi') from dual union all
  8  select 1,to_date('19-01-08 08:00','dd-mm-yy hh24:mi'), to_date('26-01-08 10:00','dd-mm-yy hh24:mi') from dual union all
  9  select 1,to_date('20-01-08 08:00','dd-mm-yy hh24:mi'), to_date('21-01-08 10:00','dd-mm-yy hh24:mi') from dual union all
10  select 2,to_date('01-01-08 08:00','dd-mm-yy hh24:mi'), to_date('10-01-08 10:00','dd-mm-yy hh24:mi') from dual union all
11  select 2,to_date('02-01-08 08:00','dd-mm-yy hh24:mi'), to_date('03-01-08 10:00','dd-mm-yy hh24:mi') from dual union all
12  select 2,to_date('05-01-08 08:00','dd-mm-yy hh24:mi'), to_date('06-01-08 10:00','dd-mm-yy hh24:mi') from dual
13  );
Table created.
SQL> create table calendar_table as
  2  (
  3  select 1 machine_id,'MON 09-30' startdate , 'MON 17-30' enddate from dual union all
  4  select 1,'TUE 09-30', 'TUE 17-30' from dual union all
  5  select 1,'WED 09-30', 'WED 17-30' from dual union all
  6  select 1,'THU 09-30','THU 17-30' from dual union all
  7  select 1,'FRI 09-30','FRI 17-30' from dual union all
  8  select 1,'SAT 00-00','SAT 00-00' from dual union all
  9  select 1,'SUN 00-00','SUN 00-00' from dual
10  );
Table created.
SQL> select j.machine_id
  2       , trunc(j.startdate) day_in_use
  3       , sum
  4         (  least(j.enddate,trunc(j.startdate) + (c.enddate-trunc(c.enddate)))
  5          - greatest(j.startdate,trunc(j.startdate) + (c.startdate-trunc(c.startdate)))
  6         ) * 24 hours_in_use
  7    from ( select j.machine_id
  8                , greatest(j.started,trunc(j.started) - 1 + row_number() over (partition by j.rowid order by null)) startdate
  9                , least(j.finished,trunc(j.started) + row_number() over (partition by j.rowid order by null)) enddate
10             from job_table j
11                , table
12                  ( cast
13                    ( multiset(select null from dual connect by level <= trunc(j.finished) - trunc(j.started) + 1)
14                      as sys.dbms_debug_vc2coll
15                    )
16                  ) t
17         ) j
18       , ( select machine_id
19                , substr(enddate,1,3) dayofweek
20                , to_date(substr(startdate,5),'hh24-mi') startdate
21                , to_date(substr(enddate,5),'hh24-mi') enddate
22             from calendar_table
23            where enddate not like '___ 00-00'
24         ) c
25   where c.machine_id = j.machine_id
26     and c.dayofweek = to_char(j.startdate,'DY','nls_date_language=american')
27   group by j.machine_id
28       , trunc(j.startdate)
29   order by j.machine_id
30       , trunc(j.startdate)
31  /
                            MACHINE_ID DAY_IN_USE                                    HOURS_IN_USE
                                     1 01-01-2008 00:00:00                                      8
                                     1 02-01-2008 00:00:00                                     16
                                     1 03-01-2008 00:00:00                                    8.5
                                     1 04-01-2008 00:00:00                                    8.5
                                     1 07-01-2008 00:00:00                                      8
                                     1 08-01-2008 00:00:00                                      8
                                     1 09-01-2008 00:00:00                                      8
                                     1 10-01-2008 00:00:00                                     .5
                                     1 21-01-2008 00:00:00                                    8.5
                                     1 22-01-2008 00:00:00                                      8
                                     1 23-01-2008 00:00:00                                      8
                                     1 24-01-2008 00:00:00                                      8
                                     1 25-01-2008 00:00:00                                      8
13 rows selected.Regards,
Rob.