I've got the following data (Table 1) and I want to calculate the balance at the end of each Gaming Date. However, when the Date Redeemed is less than the Gaming Date that means the amount needs to be subtracted from the ending balance. How do I write a statement that is looking at the Gaming Date in a specific row and the Date Redeemed in ALL previous rows and takes the sum amount of the rows where the Gaming Date is greater that the Date Redeemed (Table 2) Table2
Table1
DateRedeemed GamingDate Trip Amount
13/07/2017 03/07/2017 8001 100
17/07/2017 03/07/2017 8001 150
18/07/2017 04/07/2017 8001 125
27/07/2017 16/07/2017 8001 250
28/07/2017 16/07/2017 8001 310
27/07/2017 17/07/2017 8001 125
31/07/2017 18/07/2017 8001 75
28/07/2017 27/07/2017 8001 80
31/07/2017 28/07/2017 8001 100
Table 2
DateRedeemed GamingDate Trip Amount Running
13/07/2017 03/07/2017 8001 100 100
17/07/2017 03/07/2017 8001 150 250
18/07/2017 04/07/2017 8001 125 375
27/07/2017 16/07/2017 8001 250 525
28/07/2017 16/07/2017 8001 310 835
27/07/2017 17/07/2017 8001 125 810
31/07/2017 18/07/2017 8001 75 760
28/07/2017 27/07/2017 8001 80 590
31/07/2017 28/07/2017 8001 100 610
There may be a different solution using analytic functions instead of a scalar sub query, however, I haven't quite figured it out yet. Meanwhile here's this solution:
with t1 as (
select yd.*
, ROW_NUMBER() OVER (PARTITION BY trip ORDER BY GamingDate, DateRedeemed) rn
from YourData yd
)
select t1.*
, (select sum(amount) from t1 t2
where t2.trip = t1.trip
and t2.rn <= t1.rn
and t2.gamingdate <= t1.gamingdate
and t1.gamingdate < t2.dateredeemed) Running
from t1
order by trip, rn;
DateRedeemed | GamingDate | Trip | Amount | rn | Running :------------------ | :------------------ | ---: | -----: | :- | ------: 13/07/2017 00:00:00 | 03/07/2017 00:00:00 | 8001 | 100 | 1 | 100 17/07/2017 00:00:00 | 03/07/2017 00:00:00 | 8001 | 150 | 2 | 250 18/07/2017 00:00:00 | 04/07/2017 00:00:00 | 8001 | 125 | 3 | 375 27/07/2017 00:00:00 | 16/07/2017 00:00:00 | 8001 | 250 | 4 | 525 28/07/2017 00:00:00 | 16/07/2017 00:00:00 | 8001 | 310 | 5 | 835 27/07/2017 00:00:00 | 17/07/2017 00:00:00 | 8001 | 125 | 6 | 810 31/07/2017 00:00:00 | 18/07/2017 00:00:00 | 8001 | 75 | 7 | 760 28/07/2017 00:00:00 | 27/07/2017 00:00:00 | 8001 | 80 | 8 | 465 31/07/2017 00:00:00 | 28/07/2017 00:00:00 | 8001 | 100 | 9 | 175
I do realize that the last two rows do not match the sample result, however, I think that's due to an error in the sample result rather than an error in my code. If you can explain why the sample result is correct for those two records I can try to rework my code.
[EDIT]
Here's an alternate version that avoids the inefficient scalar subquery in favor of using an analytic function:
With Actions as (
select *, GamingDate ActionDate, 1 DBCR from Table1
union all
select *, DateRedeemed ActionDate, -1 DBCR from Table1
), Analytics as (
select *
, sum(Amount*DBCR) over (partition by trip
order by ActionDate, dbcr
, GamingDate, DateRedeemed) Running
from Actions
)
select DateRedeemed, GamingDate, Trip, Amount, Running
from Analytics
where dbcr = 1
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