Oracle SQL query to fetch data from log table - sql

Question

The below provided data is tiny snapshot of a huge log table.
Please help with me a query to identify records having the TRAN_ID's 451140014 and 440102253.
The status of the record is getting updated to 'Definite' from 'Actual'.
As per the business rules of our application it is NOT suppose to happen, I need to fetch the list of all records in this huge table where the statuses are getting updated.
ROW_ID TRAN_ID TRAN_DATE CHG_TYPE DB_SESSION DB_OSUSER DB_HOST STAT_CD
500-XNEGXU 451327759 7/24/2015 11:35:26 AM Update SBLDATALOAD siebelp pas01 Actual
500-XNEGXU 451299279 7/24/2015 10:13:18 AM Update SBLDATALOAD siebelp pas01 Actual
500-XNEGXU 451140014 7/24/2015 1:04:36 AM Update SBLDATALOAD siebelp pas01 Definite
500-XNEGXU 440102253 6/23/2015 3:10:33 PM Update SBLDATALOAD convteam pas01 Actual
500-XNEGXU 426245149 5/8/2015 2:11:21 PM Update SBLDATALOAD convteam pas11 Actual
Edit :
thanks a lot Ponder for your help. Little modification of your query to get the results in a single row. This would give me the next transaction id which flipped the status from 'Actual' to 'Definite'
select row_id, tran_id, next_tran_id,tran_date, next_tran_date,stat_cd
from (
select abc.*, lag(tran_id) over (order by tran_id desc) next_tran_id,lag(tran_date) over (order by tran_id desc) next_tran_date,
case when stat_cd='Actual' and (lag(stat_cd) over (partition by row_id order by tran_id desc)) = 'Definite' then 1
end change
from abc )
where change = 1 order by row_id, tran_id

Answer 1

This query, using function lead() displays all rows where stat_cd is Definite and prior row in order of tran_id:
select row_id, tran_id, tran_date, stat_cd
from (
select data.*,
case when stat_cd='Definite'
or (lead(stat_cd) over (order by tran_id)) = 'Definite' then 1
end change
from data )
where change = 1 order by row_id, tran_id
SQLFiddle demo
You may need to change over (order by tran_id) to over (partition by row_id order by tran_id) if your data is organized this way.
Edit: Modified query after additional informations were provided:
select row_id, tran_id, tran_date, stat_cd
from (
select xyz.*,
case
when stat_cd='Actual'
and (lead(stat_cd) over (order by tran_id)) = 'Definite' then 1
when stat_cd='Definite'
and (lag(stat_cd) over (order by tran_id)) = 'Actual' then 2
end change
from xyz)
where change is not null
SQLFiddle demo