Compare values between records.
Hi Experts,Looking for your help frame a SQL for logic.
I have a table of the source with the following values of records.
EMP_NO QTR YEAR CD AMT
-----------------------------------------------------------------------
4181537 4 2011 764913.57 QR
4181537 4 2011 WC 864913.57
4181537 4 2011 WC 964913.57
4181537 4 2011 WC 964913.57
4181537 4 2011 WC 964913.57
Desired output:
EMP_NO QTR YEAR CD AMT
-----------------------------------------------------------------------
4181537 4 2011 764913.57 QR
4181537 4 2011 WC 100000.00
4181537 4 2011 WC 100000.00
4181537 4 2011 WC 0.00
4181537 4 2011 WC 0.00
Logic:
Only for the type of recording CD = WC, I need to get the value of the amount not remove with the old amount. Means,
2nd record amount would be.
864913.57 - 764913.57 = 100000.00
3rd record would be,.
964913.57 - 864913.57 = 100000.00
record of 4 th amount would be.
964913.57 - 964913.57 = 0.00
record of 5 th amount would be.
964913.57 - 964913.57 = 0.00
Can you please help me framing a SQL for this logic. Any help would be very apprecirated.
Thank you
K
This way:
with data as
(
select 1 id, 4181537 no, 4 qtr, 2011 yr, 'QR' cd, 764913.57 amt from dual union all
select 2, 4181537, 4, 2011, 'WC', 864913.57 from dual union all
select 3, 4181537, 4, 2011, 'WC', 964913.57 from dual union all
select 4, 4181537, 4, 2011, 'WC', 964913.57 from dual union all
select 5, 4181537, 4, 2011, 'WC', 964913.57 from dual
)
select id, no, qtr, yr, cd, amt,
case
when cd = 'QR'
then amt
when cd = 'WC'
then amt - lag(amt) over (partition by no order by cd, rownum)
else
null
end diff_amt
from data;
ID NO QTR YR CD AMT AMT
---------------------- ---------------------- ---------------------- ---------------------- -- ---------------------- ----------------------
1 4181537 4 2011 QR 764913.57 764913.57
2 4181537 4 2011 WC 864913.57 100000
3 4181537 4 2011 WC 964913.57 100000
4 4181537 4 2011 WC 964913.57 0
5 4181537 4 2011 WC 964913.57 0
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