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Suppose you have two tables, "orders" and "customers", where "orders" contains information about orders and "customers" contains information about customers. Write an SQL query that calculates the average order value for each customer who has made at least 3 orders in the last month, and only includes customers who are located in the United States. The query should require a join between the two tables.
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General
Structure your query using JOIN, WHERE, GROUP BY and HAVING clauses. Consider how to calculate the date range for 'last month' and ensure proper filtering for location and order count.
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Hard Difficulty
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SQL question
SQL questions test your ability to work with relational databases. Demonstrate your proficiency in writing queries, understanding database design, optimizing performance, and extracting meaningful information from structured data.