User's First Purchase
CRM is building the first purchase date for each buyer. In a_events, use events where kind = 'purchase', find the earliest date from ts for each user_id, and return user_id and first_purchase, sorted by user_id.
Eksempel på forventet output
Sådan ser et korrekt svar ud — dets rækketal er dets eget og behøver ikke at matche skematabellerne.
| user_id | first_purchase |
|---|---|
| 1 | 2024-01-05 |
| 3 | 2024-01-05 |
| 5 | 2024-01-07 |
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