Revenue for Every User
The product mart must show revenue for every user from a_users. Sum amount from a_events only for kind = 'purchase'; if there are no purchases, show 0. Return id and revenue, sorted by id.
Eksempel på forventet output
Sådan ser et korrekt svar ud — dets rækketal er dets eget og behøver ikke at matche skematabellerne.
| id | revenue |
|---|---|
| 1 | 50 |
| 2 | 0 |
| 3 | 50 |
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