use dewiki_p;

select distinct page_title from 

revision_userindex 

inner join page on rev_page = page_id

 where rev_parent_id=0 

 and rev_user=(select user_id from user where user_name='Informationswiedergutmachung') 

 and page_namespace = 0 

 and page_id = any (select page_id from categorylinks where cl_from=page_id and cl_to='Begriffsklärung')