SQL
x
USE dewiki_p;
SELECT
SUM(IF(up_value = "male", 1, 0)) as male,
SUM(IF(up_value = "female", 1, 0)) as female,
YEAR(user_registration) as Jahr
FROM (SELECT user_id, user_registration, up_value, up_property
FROM user
INNER JOIN user_properties ON up_user=user_id) AS joined
WHERE
up_property = "gender"
GROUP BY YEAR(user_registration);
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