New topics per category (by month)

data & reporting
1

New topics per category (by month)

Returns the number of new topics created in each category for a given month, ordered by topic_count. The query accepts a ‘months ago’ parameter, defaults to 0 to give the results for the current month.

-- [params]
-- int :months_ago = 1

WITH query_period as (
    SELECT
        date_trunc('month', CURRENT_DATE) - INTERVAL ':months_ago months' as period_start,
        date_trunc('month', CURRENT_DATE) - INTERVAL ':months_ago months' + INTERVAL '1 month' - INTERVAL '1 second' as period_end
)

SELECT
    t.category_id,
    count(1) as topic_count
FROM topics t
RIGHT JOIN query_period qp
    ON t.created_at >= qp.period_start
        AND t.created_at <= qp.period_end
WHERE t.user_id > 0
    AND t.category_id IS NOT NULL
GROUP BY t.category_id
ORDER BY topic_count DESC