SQL, Power BI, and Python Basics | Dataford Interview Questions

Your question is SQL, Power BI, and Python Basics. Start with the requirements and the two tables 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.

Preguntas tecnicas de sql, powerbi, Python

This item focuses on the SQL portion. Using customers and orders, write a query that summarizes completed orders for every customer.

Output

One row per customer with customer_id, customer_name, completed_order_count, completed_revenue, and spending_band.
Include customers without completed orders, treating their count and revenue as zero.
Classify revenue as High for at least 1000, Medium for 500 to 999.99, and Low below 500.
Order by completed_revenue descending, then customer_id ascending.

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
status	VARCHAR(20)	Order lifecycle status
amount	NUMERIC(10,2)	Order amount