Hello,
cenes_test=> select version(); version
-------------------------------------------------------------PostgreSQL 7.1.3 on i686-pc-linux-gnu, compiled by GCC
2.96
(1 row)
cenes_test=> select personen.*, (select max(last_visit) from sessions
where sessions.personen_id = personen.personen_id) as max from personen
where max between 1009148400 and 1011913200 order by max desc;
ERROR: Attribute 'max' not found
I again think that the table structure is not neccesary to understand my
question.
Well, why can't I use max in the where clause?
<comment>
I do know, thanks to Josh Berkus, that this query should be reformed
using sth like
select personen.f1, personen.f2, max(last_visit) from personen join
sessions on sessions.personen_id = personen.personen_id group by
personen.f1, personen.f2
(I know that this query doesn't include persons that don't have a row
with their personen_id in sessions)
</comment>
Related:
cenes=> select version(); version
---------------------------------------------------------------PostgreSQL 7.0.2 on i686-pc-linux-gnu, compiled by gcc
2.95.2
(1 row)
cenes=> select personen.*, (select max(last_visit) from sessions where
sessions.personen_id = personen.personen_id) from personen where (select
max(zeitstempel) from sessions where sessions.personen_id =
personen.personen_id) between 1009148400 and 1011913200;
ERROR: ExecEvalExpr: unknown expression type 501
That is a query we have tried on 7.0.2 because of curiosity. But the
error message looks weird. What does it mean?
Thank you for you information.
Markus Bertheau