A three-order moving average
For paid orders in date order, return `placed_on`, `total_cents` and `moving_avg`: the average of this order and the two before it, rounded to a whole number.
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 15 min
query.sql
Expected, in this order
| placed_on | total_cents | moving_avg |
|---|---|---|
| 2026-01-04 | 12000 | 12000 |
| 2026-01-21 | 89000 | 50500 |
| 2026-02-02 | 15000 | 38667 |
| 2026-02-28 | 22000 | 42000 |
| 2026-03-03 | 7800 | 14933 |
Your result
Run your query to compare.
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