Code RoomRunning total of paid orders
HardPrep Room Coding #5055

Running total of paid orders

SQLAlgorithms & data structuresSenior–Staff~14 min

Return the paid orders in date order with a running total. Give `placed_on`, `total_cents` and `running_total`.

What a strong answer looks like

Say what the query is meant to return before you write it, and name the shape of the answer: how many rows, grouped by what. Then watch the NULLs and the duplicates, because that is where most of these are lost.

Run onlyA query runs as one statement, so there is nothing to step through. Run it and read the rows.

0:00 of about 14 min

Expected, in this order

placed_ontotal_centsrunning_total
2026-01-041200012000
2026-01-2189000101000
2026-02-0215000116000
2026-02-2822000138000
2026-03-037800145800

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