Help in calculating correct ofset for SQL

Question

Hello Everyone
Please help me in formulating sql query
Basically what I want is that I need to get desired result in such a way that, whenever Transaction type is Sales Order Issue, I want last TRANSACTION_COSTED_DATE of 'Intransit Shipment'
INVENTORY_ITEM_ID     TRANSACTION_COSTED_DATE     TRANSACTION_TYPE     R
123     28-06-2012 21:36     Intransit Shipment     
123     23-07-2012 01:25     Sales order issue     28-06-2012 21:36
123     30-07-2012 05:20     Sales order issue     28-06-2012 21:36
123     08-08-2012 20:03     Intransit Shipment     
123     23-08-2012 11:15     Intransit Shipment     
123     27-08-2012 16:19     Intransit Shipment     
123     27-08-2012 16:19     Intransit Shipment     
123     05-09-2012 04:22     Sales order issue     27-08-2012 16:19
123     05-09-2012 04:22     Sales order issue     27-08-2012 16:19
123     17-09-2012 01:42     Sales order issue     27-08-2012 16:19
123     17-10-2012 22:25     Sales order issue     27-08-2012 16:19
123     13-11-2012 21:12     Intransit Shipment     
Lag with offset 1 doesn’t work as it will only go to previous row,
What I want is that it should go to row above where transaction type is Intransit Shipment
Sample data and query I tried
with sampl_rownum_reset as
(select '123' inventory_item_id,
to_date ('28-Jun-2012 9:36:23 PM ', 'DD-MON-RRRR HH:MI:SS AM')
transaction_costed_date,
to_date ('28-Jun-2012 9:35:23 PM ', 'DD-MON-RRRR HH:MI:SS AM')
transaction_date,
'Intransit Shipment' transaction_type
from dual
union all
select '123',
to_date ('23-Jul-2012 1:25:44 AM ', 'DD-MON-RRRR HH:MI:SS AM'),
to_date ('23-Jul-2012 9:40:08 AM ', 'DD-MON-RRRR HH:MI:SS AM'),
'Sales order issue '
from dual
union all
select '123',
to_date ('30-Jul-2012 5:20:38 AM ', 'DD-MON-RRRR HH:MI:SS AM'),
to_date ('01-Aug-2012 9:37:17 AM ', 'DD-MON-RRRR HH:MI:SS AM'),
'Sales order issue '
from dual
union all
select '123',
to_date ('08-Aug-2012 8:03:04 PM ', 'DD-MON-RRRR HH:MI:SS AM'),
to_date ('08-Aug-2012 7:59:33 PM ', 'DD-MON-RRRR HH:MI:SS AM'),
'Intransit Shipment'
from dual
union all
select '123',
to_date ('23-Aug-2012 11:15:40 AM', 'DD-MON-RRRR HH:MI:SS AM'),
to_date ('23-Aug-2012 11:12:24 AM', 'DD-MON-RRRR HH:MI:SS AM'),
'Intransit Shipment'
from dual
union all
select '123',
to_date ('27-Aug-2012 4:19:46 PM ', 'DD-MON-RRRR HH:MI:SS AM'),
to_date ('27-Aug-2012 4:11:55 PM ', 'DD-MON-RRRR HH:MI:SS AM'),
'Intransit Shipment'
from dual
union all
select '123',
to_date ('27-Aug-2012 4:19:46 PM ', 'DD-MON-RRRR HH:MI:SS AM'),
to_date ('27-Aug-2012 4:11:55 PM ', 'DD-MON-RRRR HH:MI:SS AM'),
'Intransit Shipment'
from dual
union all
select '123',
to_date ('05-Sep-2012 4:22:16 AM ', 'DD-MON-RRRR HH:MI:SS AM'),
to_date ('18-Sep-2012 9:44:14 AM ', 'DD-MON-RRRR HH:MI:SS AM'),
'Sales order issue '
from dual
union all
select '123',
to_date ('05-Sep-2012 4:22:16 AM ', 'DD-MON-RRRR HH:MI:SS AM'),
to_date ('18-Sep-2012 9:44:15 AM ', 'DD-MON-RRRR HH:MI:SS AM'),
'Sales order issue '
from dual
union all
select '123',
to_date ('17-Sep-2012 1:42:43 AM ', 'DD-MON-RRRR HH:MI:SS AM'),
to_date ('17-Sep-2012 9:35:35 AM ', 'DD-MON-RRRR HH:MI:SS AM'),
'Sales order issue '
from dual
union all
select '123',
to_date ('17-Oct-2012 10:25:12 PM', 'DD-MON-RRRR HH:MI:SS AM'),
to_date ('17-Oct-2012 10:22:28 PM', 'DD-MON-RRRR HH:MI:SS AM'),
'Sales order issue '
from dual
union all
select '123',
to_date ('13-Nov-2012 9:12:43 PM ', 'DD-MON-RRRR HH:MI:SS AM'),
to_date ('13-Nov-2012 9:07:48 PM ', 'DD-MON-RRRR HH:MI:SS AM'),
'Intransit Shipment'
from dual)
select inventory_item_id,
transaction_costed_date,
transaction_date,
transaction_type,
case
when transaction_type = 'Intransit Shipment' then null
else lag (transaction_costed_date, 1) over (order by inventory_item_id,
transaction_costed_date, transaction_date)
end r
from sampl_rownum_reset
order by inventory_item_id, transaction_costed_date, transaction_date
Thanks
Sachin

Answer 1

Hi,
when you put some code please enclose it between two lines starting with {noformat}{noformat}
i.e.:
{noformat}{noformat}
SELECT ...
{noformat}{noformat}
Is this fitting your needs?SELECT inventory_item_id
, transaction_costed_date
, transaction_date
, transaction_type
, CASE transaction_type
WHEN 'Sales order issue ' THEN
LAST_VALUE (CASE transaction_type
WHEN 'Intransit Shipment' THEN
transaction_costed_date
END IGNORE NULLS)
OVER (ORDER BY inventory_item_id, transaction_costed_date, transaction_date)
END r
FROM sampl_rownum_reset
ORDER BY inventory_item_id, transaction_costed_date, transaction_date;
INVENTORY_ITEM_ID TRANSACTION_COSTED_DATE TRANSACTION_DATE TRANSACTION_TYPE R
123 28-06-2012 21:36:23 28-06-2012 21:35:23 Intransit Shipment
123 23-07-2012 01:25:44 23-07-2012 09:40:08 Sales order issue 28-06-2012 21:36:23
123 30-07-2012 05:20:38 01-08-2012 09:37:17 Sales order issue 28-06-2012 21:36:23
123 08-08-2012 20:03:04 08-08-2012 19:59:33 Intransit Shipment
123 23-08-2012 11:15:40 23-08-2012 11:12:24 Intransit Shipment
123 27-08-2012 16:19:46 27-08-2012 16:11:55 Intransit Shipment
123 27-08-2012 16:19:46 27-08-2012 16:11:55 Intransit Shipment
123 05-09-2012 04:22:16 18-09-2012 09:44:14 Sales order issue 27-08-2012 16:19:46
123 05-09-2012 04:22:16 18-09-2012 09:44:15 Sales order issue 27-08-2012 16:19:46
123 17-09-2012 01:42:43 17-09-2012 09:35:35 Sales order issue 27-08-2012 16:19:46
123 17-10-2012 22:25:12 17-10-2012 22:22:28 Sales order issue 27-08-2012 16:19:46
123 13-11-2012 21:12:43 13-11-2012 21:07:48 Intransit Shipment
Regards.
Al