Hi Benoit,
MAX() is an aggregate function, you have to use GROUP BY for it to work as
expected.
e.g. select MAX(mail_out_anon+mail_out_auth) FROM domaincounters GROUP BY
timefunction;
Hope this helps
-Guillaume
2015-06-19 10:59 GMT+02:00 Benoit Panizzon
Hi all
I stumbled over that problem, while trying to graph mail traffic..
I have two different counters for emails sent with authentication and without. Aggregated per hour.
I would like to total the both values per row, to create a graph of outgoing emails per hour.
MariaDB [maildb]> select mail_out_anon,mail_out_auth from domaincounters;
+---------------+---------------+ | mail_out_anon | mail_out_auth | +---------------+---------------+ | 8 | 58 | | 8 | 48 | | 4 | 63 | | 9 | 53 | | 2 | 36 | | 0 | 12 | | 3 | 2 | | 0 | 2 | | 0 | 6 | | 0 | 2 | | 0 | 9 | | 0 | 44 | | 14 | 63 | | 0 | 96 | | 7 | 43 | | 4 | 61 | | 2 | 43 | | 2 | 66 | | 0 | 86 | | 6 | 77 | | 6 | 55 | | 0 | 63 | | 6 | 48 | | 2 | 52 | +---------------+---------------+
select mail_out_anon+mail_out_auth as mail_out_total from domaincounters;
+-----------------------------+ | mail_out_anon+mail_out_auth | +-----------------------------+ | 70 | | 56 | | 67 | | 62 | | 38 | | 12 | | 5 | | 2 | | 6 | | 2 | | 9 | | 44 | | 77 | | 96 | | 50 | | 65 | | 45 | | 68 | | 86 | | 83 | | 61 | | 63 | | 54 | | 54 | +-----------------------------+
Now I need the max value of that addition to auto-scale the graph.
MariaDB [maildb]> select MAX(mail_out_anon+mail_out_auth) +----------------------------------+ | MAX(mail_out_anon+mail_out_auth) | +----------------------------------+ | 187 | +----------------------------------+
What did MariaDB count here? I was expecting a value 96 which is the largest value of all the additions.
Also trying various ways of first using GREATEST() always returns a way to high value.
Is it a bug, or did I do something wrong?
Mit freundlichen Grüssen
Benoit Panizzon -- I m p r o W a r e A G - ______________________________________________________
Zurlindenstrasse 29 Tel +41 61 826 93 07 CH-4133 Pratteln Fax +41 61 826 93 02 Schweiz Web http://www.imp.ch ______________________________________________________
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