Data Analysis Approach | Dataford Interview Questions

How to perform data analysis?

Using customers and orders, write a query that summarizes order activity during the first quarter of 2025. Include every customer, including customers without qualifying orders, and calculate completed-order metrics.

Output

One row per customer with customer_id, customer_name, completed_order_count, completed_revenue, average_completed_order_value, and latest_order_date.
Include only orders dated from 2025-01-01 through 2025-03-31; count and sum only orders with status completed.
Sort by completed_revenue descending, then customer_id ascending.

Schema

customers

Column	Type	Description
customer_idPK	INT	Unique customer identifier
customer_name	VARCHAR(100)	Customer display name

orders

Column	Type	Description
order_idPK	INT	Unique order identifier
customer_id	INT	Customer associated with the order
order_date	DATE	Date the order was placed
status	VARCHAR(20)	Order processing status
amount	NUMERIC(10,2)	Order amount

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