Days to first purchase
For each user who purchased, compute how many days passed from the signup date (signup_date in a_users) to their FIRST purchase. Return user_id and the number of days days, ordered by user_id.
Kampjun tal-output mistenni
Dan hu kif tidher tweġiba korretta — l-għadd tar-ringieli huwa tiegħu stess, m'għandux għalfejn jaqbel mat-tabelli tal-iskema.
| days | user_id |
|---|---|
| 4 | 1 |
| 3 | 3 |
| 4 | 5 |
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