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Akashsuper2000
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SELECT DISTINCT u1.user_name, /* selecting distinct usernames */ timestamp(u1.user_registration) as account_registration_timestamp /* selecting and renaming account registration timestamp */ FROM categorylinks cl1 /* categorylinks table that contains page to category map */ INNER JOIN revision r1 ON r1.rev_page = cl1.cl_from /* joining revision table */ INNER JOIN actor a1 ON r1.rev_actor = a1.actor_id /* joining actor table that has information about the modifier */ INNER JOIN user u1 ON a1.actor_user = u1.user_id /* joining user table to identify the user */ WHERE r1.rev_page = cl1.cl_from /* get revisions of pages whose category points to the required category */ AND cl1.cl_to = 'Images_from_Wiki_Loves_Earth_2014' /* match the required category */ AND r1.rev_parent_id = 0 /* to identify if this is a new upload or an edit */ AND timestamp(u1.user_registration) BETWEEN '2014-05-01' AND '2014-06-30'; /* match the user registration date */
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