Compare Conversion Rates by Channel | Dataford Interview Questions

Your question is Compare Conversion Rates by Channel. Start with the requirements and the one table on the right.

Run and submit as often as you like. When you're ready, talk me through your approach or go straight to the code.

Problem

Rippling’s growth team wants to compare signup conversion performance across acquisition channels for a recent campaign. Write a SQL query to calculate conversion rates by channel using a single event table.

Requirements

For each channel, count how many users had a visit event.
Count how many users had a signup event.
Return channel, visits, signups, and conversion_rate where conversion_rate = signups / visits.
Exclude rows where channel is NULL.
Order results by conversion_rate descending, then channel ascending.

Schema

rippling_growth_events

Column	Type	Description
event_idPK	INT	Unique event row ID
user_id	INT	User identifier
channel	VARCHAR(50)	Acquisition channel associated with the event
event_type	VARCHAR(20)	Event type such as visit or signup
event_date	DATE	Date the event occurred

Your question is Compare Conversion Rates by Channel. Start with the requirements and the one table on the right.

Run and submit as often as you like. When you're ready, talk me through your approach or go straight to the code.

Requirements

For each channel, count how many users had a visit event.
Count how many users had a signup event.
Return channel, visits, signups, and conversion_rate where conversion_rate = signups / visits.
Exclude rows where channel is NULL.
Order results by conversion_rate descending, then channel ascending.

Schema

rippling_growth_events

Column	Type	Description
event_idPK	INT	Unique event row ID
user_id	INT	User identifier
channel	VARCHAR(50)	Acquisition channel associated with the event
event_type	VARCHAR(20)	Event type such as visit or signup
event_date	DATE	Date the event occurred