SQL Test and Data Queries | Dataford Interview Questions

Tell me about how you would approach a SQL test with multiple questions, including writing queries and validating results.

Use the supplied tables to demonstrate one representative query and explain how you would validate its output. Include customers whose completed order value exceeds 100.

Output

One row per qualifying customer, with customer_name, completed_order_count, total_completed_amount, and latest_completed_order_date.
Include only completed orders, exclude customers whose total is 100 or less, and sort by total amount descending, then customer name 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
amount	NUMERIC(10,2)	Order amount
status	VARCHAR(20)	Order processing status
order_date	DATE	Date the order was placed

Your question is SQL Test and Data Queries. Start with the requirements and the two tables in the Question tab.

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

Problem