Need to merge the below two rows

Question

Hi,
I have a sample data as shown below:
ID     OBJID     ACT_CODE     ADDNL_INFO     ENTRY_TIME
2523540     333003736     900     from WIP default to Queue PSD1.     1/3/2012 15:07
2523540     333003271     100     100 from Queue PSD1 to WIP For assigment. 1/3/2012 15:43
2523540     333003744     900     900 from WIP default to Queue PSD1.     1/3/2012 15:49
2523540     333004966     100     100 from Queue PSD1 to WIP For assigment.     1/3/2012 16:04
I need to merge the first two rows and get a single record for each "from" and "to" as shown below (desired output)
ID_NUMBER     ADDNL_INFO     ENTRY_TIME     EXIT_TIME     TOTAL TIME
2523540     PSD1     1/3/2012 15:07     1/3/2012 15:43     0.025069444
2523540     PSD1     1/3/2012 15:49     1/3/2012 16:04     0.010231481
I have used function on the addnl_info column to display only the name of the queue "PSD1"
(SUBSTR(ADDNL_INFO, INSTR(ADDNL_INFO, 'PSD1'), LENGTH('PSD1'))) QUEUE_NAME
Can any one help me out in getting the desired output.

Answer 1

Below is a solution to your query:
drop table test_Table;
create table test_Table
  ID          number,
  objid       number,
  act_code    number,
  addl_info   varchar2(500),
  entry_time  timestamp
insert into test_Table values (2523540, 333003736, 900, 'from WIP default to Queue PSD1.', to_timestamp('1/3/2012 15:07', 'DD/MM/YYYY HH24:MI'));
insert into test_Table values (2523540, 333003271, 100, 'from Queue PSD1 to WIP For assigment.', to_timestamp('1/3/2012 15:43', 'DD/MM/YYYY HH24:MI'));
insert into test_Table values (2523540, 333003744, 900, 'from WIP default to Queue PSD1.', to_timestamp('1/3/2012 15:49', 'DD/MM/YYYY HH24:MI'));
insert into test_Table values (2523540, 333004966, 100, 'from Queue PSD1 to WIP For assigment.', to_timestamp('1/3/2012 16:04', 'DD/MM/YYYY HH24:MI'));
select * from test_table;
select id, addl_info, entry_time, exit_time, total_time
from
select a.id, a.objid, 'PSD1' addl_info, a.entry_time, lead(a.entry_time, 1, null) over (order by a.entry_time) exit_time,
       lead(a.entry_time, 1, null) over (order by a.entry_time) - a.entry_time total_time, DECODE(a.act_code, 900, 'D', 'ND') disp
  from test_Table a
where a.id = 2523540
where disp = 'D';
ID             ADDL_INFO            ENTRY_TIME          EXIT_TIME                     TOTAL_TIME
2523540     PSD1     01-MAR-12 03.07.00.000000000 PM     01-MAR-12 03.43.00.000000000 PM     0 0:36:0.0
2523540     PSD1     01-MAR-12 03.49.00.000000000 PM     01-MAR-12 04.04.00.000000000 PM     0 0:15:0.0I see a shortcoming in the design:
1. For "WIP default to Queue PSD1" there are two records, both containing different OBJID but same ID, which in ideal case should not happen. You MUST have a COMPOSITE key on ID and OBJID; This shall help you to identify the distinct records.
My solution is not perfect as it is based on the ENTRY TIME. The reason being SIMPLE Ordering by the OBJID would not lead to a correct difference in the Transaction Time (referred by you as TOTAL_TIME.); Hence, for this reason I had to use ENTRY_TIME to correctly get the total_time.
If you wish you may follow the solution else I shall always recommend to change the Table Design and follow the correct approach.
If you are changing the Table design then following shall be a solution:
select id, addl_info, entry_time, exit_time, total_time
from
select a.id, a.objid, 'PSD1' addl_info, a.entry_time, lead(a.entry_time, 1, null) over (order by a.id, a.objid) exit_time,
       lead(a.entry_time, 1, null) over (order by a.entry_time) - a.entry_time total_time, DECODE(a.act_code, 900, 'D', 'ND') disp
  from test_Table a
where disp = 'D';Regards,
P.