First Interaction Credit
A hard SQL mock interview question on DataDriven, with an AI interviewer who asks follow-up questions and a hire or no-hire decision at the end.
- Domain
- SQL
- Difficulty
- hard
- Seniority
- L5
Interview Prompt
The attribution team runs a first-touch model: every conversion is credited to the very first ad impression a user ever saw, and a user counts as converted the moment they appear in the transactions table. For each converted user return their user_id, the ad_campaign of that earliest impression, and its impression_time.
Summary
Attribute transactions to earliest touchpoint
How This Interview Works
- Read the vague prompt (just like a real interview)
- Ask clarifying questions to the AI interviewer
- Write and run your SQL against a real database
- Answer the interviewer's follow-up questions, then get a hire or no-hire decision