Is it possible to make repeat / do while /loop in simple SQL

Dear Expert,
If I would like to have the substract manipulation (column1 - column2) and repeat the calcuation in SQL using select statement while pulling data from table, is it possible?
Tks, Emily

Dear Gordon,
For example, as of today, the current stock is 200 and total ordered qty is 2000
How could I have the report to automatically calculate the "Qty short"?
PN#          Pro. date   Req. Qty     Stock       Qty ordered      Qty short
KC001       4/1/10         100            200               2000             (200-100) --> enough stock
KC001       5/15/10       400            200               2000             previous line answer (200-100) - 400 --> short so should pull in
KC001       5/30/10       300            200               2000             continue to calculate
KC002
Tks a lot, Emily

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