#1143

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.

Uzorak očekivanog izlaza

Ovako izgleda ispravan odgovor — broj redaka je njegov vlastiti, ne mora se podudarati s tablicama sheme.

daysuser_id
41
33
45

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