Revenue per customer
You've been hired at Delivr as a data analyst! A customer just called Delivr's Customer Support team; she wants to double-check whether her receipts add up. Going by her receipts, she calculated that her total bill on Delivr is $271, and she wants to make sure of that. Her user ID is 15.
Help the Customer Support team by calculating her total bill! Sum up everything she's spent on Delivr orders; in other words, calculate the total revenue that Delivr has generated from her.
Deze oefening maakt deel uit van de cursus
Analyzing Business Data in SQL
Oefeninstructies
- Write the expression for revenue.
- Keep only the records of user ID 15.
Interactieve oefening met praktijkervaring
Probeer deze oefening door deze voorbeeldcode aan te vullen.
-- Calculate revenue
SELECT ___ AS revenue
FROM meals
JOIN orders ON meals.meal_id = orders.meal_id
-- Keep only the records of customer ID 15
WHERE ___;