Ervan uitgaande dat ik uw vereiste goed begrijp, is hier een manier die gebruikmaakt van de Tabibitosan-methode om de gegevens te "groeperen" op basis van opeenvolgende null / niet-null transactie-ID's. Zodra we die informatie hebben, kunnen we een conditioneel row_number() doen op basis van het feit of de transaction_id null is of niet.
WITH sample_data AS (SELECT 253442 Invoice_Id, 23334 Customer_id, NULL Transaction_id, 1 seq FROM dual UNION ALL
SELECT 253443 Invoice_Id, 23334 Customer_id, NULL Transaction_id, 2 seq FROM dual UNION ALL
SELECT 253444 Invoice_Id, 23334 Customer_id, NULL Transaction_id, 3 seq FROM dual UNION ALL
SELECT 253445 Invoice_Id, 23334 Customer_id, 123 Transaction_id, 4 seq FROM dual UNION ALL
SELECT 1050646 Invoice_Id, 23334 Customer_id, 456 Transaction_id, 5 seq FROM dual UNION ALL
SELECT 8457065 Invoice_Id, 23334 Customer_id, 789 Transaction_id, 6 seq FROM dual UNION ALL
SELECT 9052920 Invoice_Id, 23334 Customer_id, NULL Transaction_id, 7 seq FROM dual UNION ALL
SELECT 9333044 Invoice_Id, 23334 Customer_id, NULL Transaction_id, 8 seq FROM dual UNION ALL
SELECT 9616743 Invoice_Id, 23334 Customer_id, NULL Transaction_id, 9 seq FROM dual UNION ALL
SELECT 9894491 Invoice_Id, 23334 Customer_id, NULL Transaction_id, 10 seq FROM dual UNION ALL
SELECT 10186697 Invoice_Id, 23334 Customer_id, NULL Transaction_id, 11 seq FROM dual UNION ALL
SELECT 10490938 Invoice_Id, 23334 Customer_id, NULL Transaction_id, 12 seq FROM dual UNION ALL
SELECT 10803986 Invoice_Id, 23334 Customer_id, 69709477 Transaction_id, 13 seq FROM dual UNION ALL
SELECT 11132317 Invoice_Id, 23334 Customer_id, 72103163 Transaction_id, 14 seq FROM dual UNION ALL
SELECT 11444923 Invoice_Id, 23334 Customer_id, NULL Transaction_id, 15 seq FROM dual)
-- end of mimicking your data in a "table" called sample_data
-- you wouldn't need this - you'd just select from your table directly in the sql below:
SELECT invoice_id,
customer_id,
transaction_id,
seq,
CASE WHEN transaction_id is not NULL THEN
row_number() OVER (PARTITION BY customer_id, grp ORDER BY seq)
ELSE 0
END carryover
FROM (SELECT invoice_id,
customer_id,
transaction_id,
seq,
row_number() OVER (PARTITION BY customer_id ORDER BY seq)
- row_number() OVER (PARTITION BY customer_id, CASE WHEN transaction_id IS NULL THEN 0 ELSE 1 END ORDER BY seq) grp
FROM sample_data)
ORDER BY customer_id, seq;
INVOICE_ID CUSTOMER_ID TRANSACTION_ID SEQ CARRYOVER
---------- ----------- -------------- ---------- ----------
253442 23334 1 0
253443 23334 2 0
253444 23334 3 0
253445 23334 123 4 1
1050646 23334 456 5 2
8457065 23334 789 6 3
9052920 23334 7 0
9333044 23334 8 0
9616743 23334 9 0
9894491 23334 10 0
10186697 23334 11 0
10490938 23334 12 0
10803986 23334 69709477 13 1
11132317 23334 72103163 14 2
11444923 23334 15 0
Voor de aanvullende eis:
WITH sample_data AS (SELECT 253442 Invoice_Id, 23334 Customer_id, 0 Transaction_Count, 1 seq FROM dual UNION ALL
SELECT 253443 Invoice_Id, 23334 Customer_id, 0 Transaction_Count, 2 seq FROM dual UNION ALL
SELECT 253444 Invoice_Id, 23334 Customer_id, 1 Transaction_Count, 3 seq FROM dual UNION ALL
SELECT 253445 Invoice_Id, 23334 Customer_id, 1 Transaction_Count, 4 seq FROM dual UNION ALL
SELECT 1050646 Invoice_Id, 23334 Customer_id, 0 Transaction_Count, 5 seq FROM dual UNION ALL
SELECT 8457065 Invoice_Id, 23334 Customer_id, 0 Transaction_Count, 6 seq FROM dual UNION ALL
SELECT 9052920 Invoice_Id, 23334 Customer_id, 2 Transaction_Count, 7 seq FROM dual UNION ALL
SELECT 9333044 Invoice_Id, 23334 Customer_id, 1 Transaction_Count, 8 seq FROM dual UNION ALL
SELECT 9616743 Invoice_Id, 23334 Customer_id, 0 Transaction_Count, 9 seq FROM dual UNION ALL
SELECT 9894491 Invoice_Id, 23334 Customer_id, 0 Transaction_Count, 10 seq FROM dual UNION ALL
SELECT 10186697 Invoice_Id, 23334 Customer_id, 0 Transaction_Count, 11 seq FROM dual UNION ALL
SELECT 10490938 Invoice_Id, 23334 Customer_id, 0 Transaction_Count, 12 seq FROM dual UNION ALL
SELECT 10803986 Invoice_Id, 23334 Customer_id, 1 Transaction_Count, 13 seq FROM dual UNION ALL
SELECT 11132317 Invoice_Id, 23334 Customer_id, 1 Transaction_Count, 14 seq FROM dual UNION ALL
SELECT 11444923 Invoice_Id, 23334 Customer_id, 0 Transaction_Count, 15 seq FROM dual)
-- end of mimicking your data in a "table" called sample_data
-- you wouldn't need this - you'd just select from your table directly in the sql below:
SELECT invoice_id,
customer_id,
Transaction_Count,
seq,
SUM(transaction_count) OVER (PARTITION BY customer_id,
CASE WHEN Transaction_Count = 0 THEN 0 ELSE 1 END,
grp
ORDER BY seq) carryover
FROM (SELECT invoice_id,
customer_id,
Transaction_Count,
seq,
row_number() OVER (PARTITION BY customer_id
ORDER BY seq)
- row_number() OVER (PARTITION BY customer_id,
CASE WHEN Transaction_Count = 0 THEN 0 ELSE 1 END
ORDER BY seq) grp
FROM sample_data)
ORDER BY customer_id, seq;
INVOICE_ID CUSTOMER_ID TRANSACTION_COUNT SEQ CARRYOVER
---------- ----------- ----------------- ---------- ----------
253442 23334 0 1 0
253443 23334 0 2 0
253444 23334 1 3 1
253445 23334 1 4 2
1050646 23334 0 5 0
8457065 23334 0 6 0
9052920 23334 2 7 2
9333044 23334 1 8 3
9616743 23334 0 9 0
9894491 23334 0 10 0
10186697 23334 0 11 0
10490938 23334 0 12 0
10803986 23334 1 13 1
11132317 23334 1 14 2
11444923 23334 0 15 0
Het maakt gebruik van een zeer vergelijkbaar concept als de oorspronkelijke oplossing, behalve door de controle voor nul of niet-nul transaction_count toe te voegen aan de partitie door clausule van de analytische functie eindsom (), we hebben de case-instructie niet langer nodig om 0 of de som uit te voeren .
Hopelijk kun je zien welke aanpassingen ik moest maken - in feite moesten de controles voor transaction_id is null/not null worden gewijzigd in transaction_count =0/!=0, plus de wijziging van row_number() naar sum(transaction_count) plus de bovengenoemde wijziging van de partitie per clausule. Ik weet zeker dat als je er wat langer over had nagedacht, je tot dezelfde conclusie zou zijn gekomen, als je dat nog niet had gedaan! *{:-)