Massa, Harald Armin, 20.11.2009 11:31:
no, that does not work:
"id_bf";"wert";"max"
98;"blue";"2009-11-10 00:00:00"
98;"red";"2009-11-10 00:00:00"
result is: I get the date of the youngest value.
My expected result is:
98;"red"
(that is, the entry of "wert" that is youngest)
Sorry then I misunderstood your requirement
I don't think windowing functions are the best choice here.
I'd probably use something like:
SELECT r1.id_bf, r1.wert
FROM rfmitzeit r1
WHERE letztespeicherung =
(SELECT max(letztespeicherung)
FROM rfmitzeit r2
WHERE r2.id_bf = r1.id_bf)
Not really different to your solution, but I think it's easier to read
(personal taste!) but it also could be slightly more efficient. But most
probably the optimizer is smart enough...
Regards
Thomas
P.S.: could you please turn off the HTML format for your mails.
Especially the SQL statements are very hard to read...
--
Sent via pgsql-general mailing list (pgsql-general@postgresql.org)
To make changes to your subscription:
http://www.postgresql.org/mailpref/pgsql-general
