Code RoomCash movement by month
MediumPrep Room Coding #5098

Cash movement by month

SQLAlgorithms & data structuresMid–Senior~11 min

For the Cash account, total the entries per calendar month. Return `month` as YYYY-MM and `net_cents`, earliest first.

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 11 min

Expected, in this order

monthnet_cents
2026-0148500
2026-0224000

Your result

Run your query to compare.

1 more set of rows are waiting. Free with an account.