Rank() SQL eller sådan noget

Brug LAG analytisk funktion:

SELECT "Date",
       GREATEST(
         account_balance - LAG(account_balance, 1, 0) OVER (ORDER BY "Date"),
         0
       ) AS credit,
       GREATEST(
         LAG(account_balance, 1, 0) OVER (ORDER BY "Date") - account_balance,
         0
       ) AS debit,
       account_balance
FROM   table_name

Hvilket, for eksempeldata:

CREATE TABLE table_name ( "Date", account_balance ) AS
SELECT Date '2021-01-01', +1000 FROM DUAL UNION ALL
SELECT Date '2021-01-02', + 500 FROM DUAL UNION ALL
SELECT Date '2021-01-03', - 200 FROM DUAL;

Udgange:

For at beregne i den modsatte retning:

SELECT "Date",
       credit,
       debit,
       SUM(credit-debit) OVER (ORDER BY "Date") AS account_balance
FROM   table_name

Hvilket, for eksempeldata:

CREATE TABLE table_name ( "Date", credit, debit ) AS
SELECT Date '2021-01-01', 1000,   0 FROM DUAL UNION ALL
SELECT Date '2021-01-02',    0, 500 FROM DUAL UNION ALL
SELECT Date '2021-01-03',    0, 700 FROM DUAL;

Udgange:

db<>fiddle her