Explain SQL Query Execution Order | Dataford Interview Questions

Explain the logical order of execution of a SQL query.

Asked in the L2 stage. Use the customers and orders tables to illustrate the explanation with a query that returns qualifying customers.

Output

Return customer_name, completed_orders, and total_completed.
Include completed orders from 2025 onward, keeping customers whose total is at least 100.
Sort by total_completed descending, then customer_name ascending, and return at most 5 rows.

customers

orders

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

Your question is Explain SQL Query Execution Order. Start with the requirements and the two tables in the Question tab.

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Explain the logical order of execution of a SQL query.

Asked in the L2 stage. Use the customers and orders tables to illustrate the explanation with a query that returns qualifying customers.

Return customer_name, completed_orders, and total_completed.
Include completed orders from 2025 onward, keeping customers whose total is at least 100.
Sort by total_completed descending, then customer_name ascending, and return at most 5 rows.

customers

orders

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

Your question is Explain SQL Query Execution Order. 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.