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-- remove count if you want to see actual missing id's
select  count(su.seqid) as [deleted questions]
from (select row_number() over (order by id) as seqid 
from Posts p where p.posttypeid = 1) as su
left join Posts p on p.id = su.seqid
where
 p.id is null

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edited jul 25 14 anonymous

created jul 20 14 rene