Linux : Slackware : PostgreSQL 8.3.7 find the duplicates in a table

“PostgreSQL 8.3.7 on i686-pc-linux-gnu, compiled by GCC gcc (GCC) 4.1.2″

ext_id should be unique, but its not, so to get all the records with duplicate ext_id :

select 
ext_id 
from dd_out dd 
where true 
and ext_id in 
(
  select ext_id  as ddd from (
    select count(s.ext_id) as cnt, s.ext_id from dd_out s where true group by s.ext_id 
  ) as cra  
  where cnt > 1 
)
;

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