Rank Campaign Segments by Conversion | Dataford Interview Questions

NovaCart ran a marketing campaign and wants to know which customer segment converted best. Write a SQL query to identify the highest-converting segment for a specific campaign.

Requirements

Consider only customers who were sent campaign CMP100.
Define a conversion as a purchase made within 7 days after the campaign send date.
Return one row per customer segment with:
- total targeted customers
- number of converted customers
- conversion rate as a percentage rounded to 2 decimals
- rank by conversion rate, highest first
Exclude segments with fewer than 2 targeted customers.

Schema

customers

Column	Type	Description
customer_idPK	INT	Unique customer identifier
customer_name	VARCHAR(100)	Customer full name
segment	VARCHAR(50)	Customer marketing segment
signup_date	DATE	Customer signup date

campaign_sends

Column	Type	Description
send_idPK	INT	Unique campaign send record
campaign_id	VARCHAR(20)	Campaign identifier
customer_id	INT	Customer who received the campaign
send_date	DATE	Date the campaign was sent

orders

Column	Type	Description
order_idPK	INT	Unique order identifier
customer_id	INT	Customer who placed the order
order_date	DATE	Date the order was placed
order_amount	DECIMAL(10,2)	Order value

Your question is Rank Campaign Segments by Conversion. Start with the requirements and the three tables in the Question tab.

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