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Vidya816
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SQL
select distinct us.user_name, us.user_registration /* selecting unique uploaders */ from categorylinks cg Inner join revision re on re.rev_page = cg.cl_from /*combining revision and categorylinks tables having common page_id references*/ inner join actor ac on re.rev_actor = ac.actor_id /* joining the above result with actor table based on common actor_id references*/ inner join user us on ac.actor_user = us.user_id /* finally joining the above result with user table having common user_id keys*/ where (us.user_registration >= 20140501000000 and us.user_registration <= 20140630000000) /* filtering the campaign period from May to June 2014*/ and (cg.cl_to = 'Images_from_Wiki_Loves_Earth_2014' and re.rev_parent_id = 0) /*selecting the required category having new page creations*/
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