newbie retention using thanks

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

SQL

use kowiki_p;

select A.user_id

from (select *
	from user
    where (
      user_registration < timestamp('2018-03-01')
      and user_registration >= timestamp('2018-02-22'))) as A
    
join (select *
    from revision
    where (
        rev_timestamp < timestamp('2018-04-01') 
        and rev_timestamp >= timestamp('2018-02-22') 
        and rev_user != 0)
    group by rev_user) as B
    
on A.user_id = B.rev_user;

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