Anwering my own question... it helps to specify an actual join
condition.

This worked:
extra['last_event_when'] = "SELECT event_loggedevent.when FROM
event_loggedevent,event_eventrelation WHERE
(event_eventrelation.event_id = event_loggedevent.id) AND
(event_eventrelation.content_type_id = %s) AND
(event_eventrelation.object_id = common_idxlead.id) ORDER BY
event_loggedevent.when DESC limit 1" % ct

... off to amazon to look for a decent sql book so I can avoid asking
silly questions in the future.


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