-- Paid media cost per click, by currency
-- Cost over clicks of paid media in the month.
SELECT strftime(date, '%Y-%m') AS month, currency AS grp, sum(cost) AS num, sum(clicks) AS den, sum(cost) / NULLIF(sum(clicks), 0) AS value FROM marketing.ad_spend_daily WHERE date >= TIMESTAMP '2023-10-01' AND date < TIMESTAMP '2026-10-01' GROUP BY 1, 2 ORDER BY 1, 2