Как да направя текущи суми от втората колона

SQL Fiddle

Настройка на схема на Oracle 11g R2 :

CREATE TABLE lots ( Lot_Size, Reported_QTY ) AS SELECT 150, 100 FROM DUALUNION ALL SELECT 150, 100 FROM DUALUNION ALL SELECT 150, 80 FROM DUALUNION ALL SELECT 150, 80 FROM DUALUNION ALL SELECT 150, 5 FROM DUAL;  

Заявка 1 :

SELECT Lot_Size, Reported_QTY, COALESCE( LAG( Reported_QTY) OVER (ORDER BY NULL) - Reported_QTY, Lot_Size - Reported_QTY ) AS Qty_BalanceFROM Lots 

Резултати :