Price Point Reality Check
Loopwire publishes a list price per tier, but discounts get agreed in sales calls and what a customer actually pays is recorded on the contract. Finance wants to know how far the two have drifted apart, tier by tier, across every contract ever signed — cancelled ones included, because a deal that was discounted to death before ending is exactly the kind finance is hunting for.
subscriptions — one row per contract. account_id points at a row in accounts. plan is the tier the customer bought. mrr is what that contract bills every month, in dollars. start_date is the day it began. A contract that has stopped carries the day it stopped in end_date; one that is still running has nothing there, shown as — below and stored as NULL.
| id | account_id | plan | mrr | start_date | end_date |
|---|---|---|---|---|---|
| 1 | 1 | starter | 49 | 2022-11-03 | 2023-02-03 |
| 2 | 1 | growth | 149 | 2023-02-03 | — |
| 3 | 2 | growth | 149 | 2022-12-15 | 2023-06-15 |
| 4 | 3 | starter | 49 | 2023-01-31 | — |
| 5 | 4 | growth | 149 | 2023-02-06 | — |
| 6 | 5 | enterprise | 499 | 2023-02-22 | — |
| 7 | 6 | starter | 49 | 2023-03-01 | 2023-04-01 |
| 8 | 7 | growth | 149 | 2023-03-22 | — |
| 9 | 8 | enterprise | 499 | 2023-04-28 | — |
| 10 | 2 | starter | 49 | 2023-06-15 | — |
The table already exists in the database — there is nothing to create or load.
Task: Write a query that returns one row per plan, with columns plan and avg_mrr, avg_mrr being the mean monthly billing of that plan's contracts rounded to 2 decimal places. Every contract counts, running or stopped. Highest mean first.
Example output
Shape only — the tier names are the real ones, the figures are invented. A round mean comes back plain, as 900 rather than 900.00:
| plan | avg_mrr |
|---|---|
| enterprise | 900 |
| growth | 262.5 |
| starter | 75 |
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