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This query is marked as a draft
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Akashsuper2000
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SQL
SELECT DISTINCT u1.user_name, u1.user_registration FROM category c1 INNER JOIN page p1 ON c1.cat_title = p1.page_title INNER JOIN revision r1 ON r1.rev_page = p1.page_title INNER JOIN actor a1 ON r1.rev_actor = a1.actor_id INNER JOIN user u1 ON u1.user_id = a1.actor_user WHERE c1.cat_title = 'Wiki_Loves_Earth' AND EXTRACT(YEAR FROM u1.user_registration) = 2014;
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