Code RoomLedger inflow and outflow
HardPrep Room Coding #5133

Ledger inflow and outflow

SQLAlgorithms & data structuresSenior~14 min

For each ledger account, split its entries into `inflow_cents` (positive amounts) and `outflow_cents` (negative amounts, reported as a positive number). Return `name`, `inflow_cents` and `outflow_cents`, ordered by name.

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

nameinflow_centsoutflow_cents
Cash820009500
Fees15000
Refunds80000
Revenue082000

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