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

SQL

use kowiki_p;

select * 
from user
where
	user_name in (select distinct rev_user_text 
                 from revision
                 where 
                 	rev_timestamp < timestamp('2018-06-01') and rev_timestamp >= timestamp('2018-05-01')
                 );       
    #and
    #not exists (select distinct rev_user_text 
    #             	 from revision r
    #             	 where 
    #             	 rev_timestamp < timestamp('2018-05-01') and rev_timestamp >= timestamp('2018-04-01')
    #             	 and
    #            	 u.user_name = r.rev_user_text
    #           		 );
#must have logic error

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