SELECT * FROM agent_log t1
WHERE timestamp < now() - interval '7 days' 
AND timestamp < ( 
   SELECT max(timestamp)
   FROM agent_log t2
   WHERE t2.class=t1.class AND t2.promiser=t1.promiser
    AND t2.hostname=t1.hostname AND t2.ip_address=t1.ip_address
)
ORDER by class,timestamp;

[download]
You almost had me there, but I don't think this will keep the maximum timestamp per day.

Neil Watson
watson-wilson.ca

In reply to Re^4: Help on selecting and deleting many records in a DB. by neilwatson
in thread Help on selecting and deleting many records in a DB. by neilwatson

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