ДРР по категориям рекламных кампаний за последний месяц
SQL, по которому посчитано
SELECT
category,
round(sum(cost), 0) AS ad_cost,
round(sum(revenue), 0) AS ad_revenue,
round(sum(cost) / nullif(sum(revenue), 0), 4) AS drr
FROM ads
WHERE date >= (SELECT date_trunc('month', max(date)) FROM ads)
AND category <> 'Все'
GROUP BY category
ORDER BY drr DESC