Fifo Inventory with SQL - sql

Question

I need one adaptation for the first table because there are negative issues points and I need the net table considerating the negatives points as debit of the first time of issue. E.g:
FechaEmi Cuenta PtosEmi PtosCan
30/06/2015 1 100 0
31/07/2015 1 120 0
31/08/2015 1 130 0
31/08/2015 1 0 55
30/09/2015 1 50 0
31/10/2015 1 30 0
30/11/2015 1 70 0
31/12/2015 1 95 0
31/01/2016 1 50 0
29/02/2016 1 0 74
31/03/2016 1 50 0
30/04/2016 1 15 0
30/06/2015 2 20 0
31/07/2015 2 30 0
31/08/2015 2 40 0
30/09/2015 2 350 0
30/06/2015 3 150 0
31/07/2015 3 120 0
31/08/2015 3 0 56
31/08/2015 3 220 0
30/06/2015 4 70 0
31/07/2015 4 134 0
31/08/2015 4 12 0
30/06/2015 5 97 0
31/07/2015 5 130 0
31/08/2015 5 15 0
30/09/2015 5 135 0
31/10/2015 5 20 0
30/11/2015 5 140 0
31/12/2015 5 25 0
31/01/2016 5 145 0
29/02/2016 5 0 25
where:
FechaEmi= Date;
Cuenta=ID;
PtosEmi=Issues points;
PtosCan=Canceled points
I want this table
FechaEmi Cuenta PtosEmi
30/06/2015 1 0
31/07/2015 1 91
31/08/2015 1 130
30/09/2015 1 50
31/10/2015 1 30
30/11/2015 1 70
31/12/2015 1 95
31/01/2016 1 50
31/03/2016 1 50
30/04/2016 1 15
30/06/2015 2 20
31/07/2015 2 30
31/08/2015 2 40
30/09/2015 2 350
30/06/2015 3 94
31/07/2015 3 120
31/08/2015 3 220
30/06/2015 4 70
31/07/2015 4 134
31/08/2015 4 12
30/06/2015 5 72
31/07/2015 5 130
31/08/2015 5 15
30/09/2015 5 135
31/10/2015 5 20
30/11/2015 5 140
31/12/2015 5 25
31/01/2016 5 145
I have this code. The problem is that doesn't do anything with the points that were debited in a date that there are not issues point. How can you recommend me change that query? Thanks!
with cte as(
select Fechaemi, Cuenta,PtosEmi,PtosCan
,row_number() over (partition by Fechaemi,Cuenta order by Fechaemi,Cuenta) as rank
from emision)
select a.Fechaemi, a.Cuenta,a.PtosEmi - coalesce(b.PtosCan, 0) stock
from cte a
left join cte b on
a.FechaEmi= b.FechaEmi and a.Cuenta = b.Cuenta and a.rank = b.rank - 1
where a.PtosEmi - coalesce(b.PtosCan, 0) > 0 order by a.cuenta asc, a.fechaemi asc

Answer 1

SQL FIDDLE DEMO
with totalPay as(
SELECT Cuenta, SUM(PtosCan) TotalPayment
FROM emision
GROUP BY Cuenta
),
totalDebt as (
SELECT FechaEmi, Cuenta, (SELECT SUM(PtosEmi)
FROM emision e2
WHERE e2.FechaEmi <= e.FechaEmi
AND e2.Cuenta = e.Cuenta
) AS TotalDebt
FROM emision e
WHERE e.PtosEmi <> 0
)
select
e.FechaEmi,
e.Cuenta,
e.PtosEmi,
td.TotalDebt,
tp.TotalPayment,
CASE
WHEN td.TotalDebt < tp.TotalPayment THEN 0
WHEN td.TotalDebt - tp.TotalPayment > PtosEmi THEN PtosEmi
ELSE td.TotalDebt - tp.TotalPayment
END Remaining
FROM
totalDebt td inner join
totalPay tp on td.Cuenta = tp.Cuenta inner join
emision e on td.FechaEmi = e.FechaEmi AND td.Cuenta = e.Cuenta
WHERE
e.PtosEmi <> 0

Answer 2

Possibly not the most elegant, but explicit way:
WITH
PtosEmi AS(
SELECT FechaEmi, cuenta, SUM(PtosEmi) as PtosEmi
FROM table1
GROUP BY FechaEmi, cuenta),
PtosCan AS (
SELECT MIN(FechaEmi) as FechaEmi, cuenta, SUM(PtosCan) as PtosCan
FROM table1
GROUP BY cuenta)
SELECT
e.FechaEmi,
e.cuenta,
e.ptosemi,
c.ptoscan,
e.ptosemi - COALESCE(c.ptoscan, 0) total
FROM
PtosEmi e LEFT JOIN
PtosCan c ON e.FechaEmi = c.FechaEmi AND e.cuenta = c.cuenta
ORDER BY e.cuenta, e.FechaEmi
This is based on the assumption that you cannot have cancellations before anything was issued for give cuenta.
Also if you have more cancelled items in total compared to what was issued initially, total value will be negative.
http://sqlfiddle.com/#!6/9ac40/11
Update
as you want to reduce cancellations line by line here is updated query:
WITH
ptosemi AS(
SELECT FechaEmi, cuenta,
PtosEmi as PtosEmi,
SUM(PtosEmi) OVER (PARTITION BY cuenta ORDER BY FechaEmi) runsum
FROM table1),
PtosCan AS (
SELECT cuenta, SUM(PtosCan) as PtosCan
FROM table1
GROUP BY cuenta)
SELECT
e.FechaEmi,
e.cuenta,
e.ptosemi,
e.runsum,
c.ptoscan,
CASE
WHEN e.runsum <= c.ptoscan
THEN 0
WHEN c.ptoscan BETWEEN e.runsum - e.ptosemi AND e.runsum
THEN e.runsum - COALESCE(c.ptoscan, 0)
ELSE e.ptosemi END total
FROM
ptosemi e LEFT JOIN
PtosCan c ON e.cuenta = c.cuenta
ORDER BY e.cuenta, e.FechaEmi
http://sqlfiddle.com/#!6/8036c2/25