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select * from (select Id, PostId, leftC, rightC from (select pright.Id, pleft.PostId, pleft.CreationDate as leftC, pright.CreationDate as rightC,
Row_number() OVER(PARTITION BY pright.Id order by pleft.CreationDate ASC) as  rnq
from 
(select phis.Id, phis.PostId, phis.CreationDate from PostHistory as phis 
 inner join Posts p on p.Id = phis.PostId 
 where p.PostTypeId = 1
 and phis.PostHistoryTypeId = 5
 ) as pleft
 inner join (
     select phis.Id, phis.PostId, phis.Comment, phis.CreationDate from PostHistory as phis 
   inner join Posts p on p.Id = phis.PostId 
     where p.PostTypeId = 1 
     and phis.PostHistoryTypeId = 5
        and lower(phis.Comment) like '%add%example%'
        and lower(phis.Comment) not like '%solution%'
        and lower(phis.Comment) not like '%attempt%'
     and lower(phis.Comment) not like '%code%'  
     and lower(phis.Comment) not like '%clarify%'
     and lower(phis.Comment) not like '%format%'
     and lower(phis.Comment) not like '%title%'
     and lower(phis.Comment) not like '%tag%'
     /*and phis.Comment not like '%clarify%'*/
 ) as pright
on pleft.PostId = pright.PostId
where pleft.CreationDate > pright.CreationDate) t
where t.rnq = 1) question

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