sorting and grouping with min/max

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От vivawasser
Тема sorting and grouping with min/max
Дата
Msg-id 49A9D1D9.1050708@vivawasser.de
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Ответы Re: sorting and grouping with min/max
Список pgsql-novice
Hi everybody,

my table is:
id    params    player    cmd_nr    date
1    a:4:{s:3:"cmd";s:7:"bewegen";s:2:"id";s:1:"8";s:8...    dompie
1    2009-02-28 23:45:48.020761+01
2    a:4:{s:3:"cmd";s:7:"bewegen";s:2:"id";s:1:"8";s:8...    dompie
2    2009-02-28 23:45:48.530177+01
3    a:4:{s:3:"cmd";s:7:"bewegen";s:2:"id";s:1:"8";s:8...    dompie
3    2009-02-28 23:45:48.977044+01
5    a:4:{s:3:"cmd";s:3:"neu";s:4:"name";s:4:"Oger";s:...    thoto
2    2009-02-28 23:46:20.754546+01
6    a:4:{s:3:"cmd";s:3:"neu";s:4:"name";s:6:"Magier";...    thoto
3    2009-02-28 23:46:29.898683+01
7    a:4:{s:3:"cmd";s:3:"neu";s:4:"name";s:5:"Prinz";s...     thoto
4    2009-02-28 23:46:37.643187+01
8    a:4:{s:3:"cmd";s:3:"neu";s:4:"name";s:10:"Prinzes...    tamborin
1    2009-02-28 23:46:51.675636+01
9    a:4:{s:3:"cmd";s:3:"neu";s:4:"name";s:6:"Drache";...    tamborin
2    2009-02-28 23:47:23.30321+01

i'm looking for a query that returns one row for each player with the
smallest cmd_nr value. after several hours i figured out the following query

SELECT * FROM command_queue GROUP BY id, params, player, cmd_nr, date
HAVING (player, cmd_nr) IN (SELECT player, MIN(cmd_nr) FROM
command_queue GROUP BY player)

that seems to me a bit complex for such a simple task. Is there maybe a
more easy way to achieve the same result?

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