How_to_retrieve_data_from_two_or_more_tables/exer_5C50.sql

SELECT vendor_state, vendor_city, COUNT(*) AS invoice_qty,
ROUND(AVG(invoice_total), 2) AS invoice_avg
FROM invoices JOIN vendors
ON invoices.vendor_id = vendors.vendor_id
GROUP BY vendor_state, vendor_city
HAVING COUNT(*) >= 2
ORDER BY vendor_state, vendor_city