SQL
x
use dewiki_p;
SELECT
CONCAT(SUBSTR(user_registration, 1, 4), 'q', (SUBSTR(user_registration, 5, 2) - 1) DIV 3 + 1) AS registration_date,
-- SUBSTR(user_registration, 1, 6) AS registration_date,
count(*) AS new_users
FROM (
SELECT
user_id,
user_registration,
) tmp
GROUP BY registration_date
ORDER BY registration_date
;
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