Delete all duplicate records in a table


create table ANAR_rej as
select * from 
(
select /*+ parallel (t 16) */ rowid as rid,FFCODE
 count(*) over (partition by FFCODE) as count#,
 row_number() over (partition by FFCODE order by rowid) as order# 
from ANAR_post t 
) where count#>1
;
delete from contract_service_post where rowid in (select rid from contract_service_rej where order#>1)
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