SELECT EXTRACT(YEAR FROM (CAST(invoice_date AS TIMESTAMP))) AS YEAR,
billing_country, COUNT(total) AS total_invoice
FROM invoice
GROUP BY YEAR, billing_country
WHERE YEAR IN (SELECT YEAR
FROM
(SELECT EXTRACT(YEAR FROM (CAST(invoice_date AS TIMESTAMP))) AS YEAR, SUM(total) AS revenue
FROM invoice
WHERE EXTRACT(MONTH FROM (CAST(invoice_date AS TIMESTAMP))) IN (6,7,8)
GROUP BY YEAR
ORDER BY revenue DESC
LIMIT 1) AS correct_year)
ORDER BY total_invoice DESC
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