Miguel Miranda escribió:
> I cant use a unique index because i only want to check for duplicates where
> processed = 2, for simplicity i did not include that condition in the
> example.

In that case you can create a partial unique index:

create index foo on cdr_ama_stat (abonado_a, abonado_b, fecha_llamada,
duracion) where processed = 2;

-- 
Alvaro Herrera                                http://www.CommandPrompt.com/
PostgreSQL Replication, Consulting, Custom Development, 24x7 support

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