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) AN
I have a page that needs to display basic user information plus the
last logged activity date for the user, and I need to be able to sort
by that value. (there are two of these relations,I'm just mentioning
one here) My SQL-fu is very, very weak and I just can't seem to get
it.
There is a table
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