Microtask-1 - Quarry

This query is marked as a draft This query has been published by Ramu ummadishetty.

Gsoc

SQL

select  distinct u.user_name,u.user_registration from user u 
inner join 
(select a.actor_user as au from actor a
Inner join 
(select r.rev_actor as ra from categorylinks cl  
Inner join revision r on r.rev_page = cl.cl_from
where cl.cl_to = 'Images_from_Wiki_Loves_Earth_2014'  and cl.cl_type = 'file' and r.rev_parent_id = 0) ac_id 
 on ac_id.ra = a.actor_id) ar
 on ar.au = u.user_id
 where u.user_registration >= 20140501000000 and u.user_registration <= 20140630000000;

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