open("query.sql", "w").write("""SELECT c.name, ROUND(SUM(o.amount), 2) AS revenue
FROM customers c JOIN orders o ON o.customer_id = c.id
WHERE lower(o.status) = 'paid' AND o.ordered_on >= '2026-03-01' AND o.ordered_on < '2026-04-01'
GROUP BY c.id ORDER BY revenue DESC, c.name;
""")