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Re: Improve reduce functions of SQLite3 request

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From Dennis Lee Bieber <wlfraed@ix.netcom.com>
Subject Re: Improve reduce functions of SQLite3 request
Date Mon, 04 Feb 2013 18:47:14 -0500
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On Mon, 4 Feb 2013 22:05:08 +0000 (UTC), Steffen Mutter
<steffen@webanimations.de> declaimed the following in
gmane.comp.python.general:


> There's much more stuff in the table of the database, but these ones
> does not matter, the table Runde20122013 stores all the data needed for
> gameplay during this season and is made to handle ALL leagues in germany
> and if you enter another federation name as 'dhb' it could handle even
> more...
>  Jutst to explain: the numbers define the team(s) of the club in a
> special category (male/female, youth E,D,C,B,A adults, senior), playing
> in a league. 

	Which does, to me, imply an unnormalized database. The
"team/category" should be a separate field.

club(*ID*, name)

team(*ID*, /club/, category)

{where *..* is primary key, /../ is a foreign key}

and league should probably be another table (and "club" may have a
/league/ entry).

	Yes, that would imply using JOINs to get a full identifier, and
maybe more complex GROUP BY terms...

> Woha!
> Why didn't I get this out by myself?

	Well, I only got the idea after someone else mentioned using min();
but I don't recall if they had GROUP BY in that suggestion. GROUP BY
ensures the min() only applies when the "nr" is the same.
-- 
	Wulfraed                 Dennis Lee Bieber         AF6VN
        wlfraed@ix.netcom.com    HTTP://wlfraed.home.netcom.com/

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Thread

Improve reduce functions of SQLite3 request Steffen Mutter <steffen@webanimations.de> - 2013-02-03 09:46 +0000
  Re: Improve reduce functions of SQLite3 request Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2013-02-03 13:11 -0500
    Re: Improve reduce functions of SQLite3 request Steffen Mutter <steffen@webanimations.de> - 2013-02-04 14:30 +0000
      Re: Improve reduce functions of SQLite3 request Dave Angel <davea@davea.name> - 2013-02-04 10:30 -0500
      Re: Improve reduce functions of SQLite3 request Peter Otten <__peter__@web.de> - 2013-02-04 17:29 +0100
      Re: Improve reduce functions of SQLite3 request Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2013-02-04 15:45 -0500
        Re: Improve reduce functions of SQLite3 request Steffen Mutter <steffen@webanimations.de> - 2013-02-04 22:05 +0000
          Re: Improve reduce functions of SQLite3 request Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2013-02-04 18:47 -0500
            Re: Improve reduce functions of SQLite3 request Steffen Mutter <steffen@webanimations.de> - 2013-02-06 09:18 +0000
              Re: Improve reduce functions of SQLite3 request Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2013-02-06 12:26 -0500
                Re: Improve reduce functions of SQLite3 request Steffen Mutter <steffen@webanimations.de> - 2013-02-06 23:33 +0000
                Re: Improve reduce functions of SQLite3 request Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2013-02-07 00:40 -0500
                Re: Improve reduce functions of SQLite3 request Steffen Mutter <steffen@webanimations.de> - 2013-02-07 11:33 +0000
                Re: Improve reduce functions of SQLite3 request Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2013-02-07 13:03 -0500
                Re: Improve reduce functions of SQLite3 request Steffen Mutter <steffen@webanimations.de> - 2013-02-07 22:54 +0000
                Re: Improve reduce functions of SQLite3 request Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2013-02-08 12:17 -0500
                Re: Improve reduce functions of SQLite3 request Steffen Mutter <steffen@webanimations.de> - 2013-02-08 19:59 +0000

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