Re: Function to Pivot data

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От Bruno Wolff III
Тема Re: Function to Pivot data
Дата
Msg-id 20020212172604.GA15113@wolff.to
обсуждение исходный текст
Ответ на Re: Function to Pivot data  (Andrew Sullivan <andrew@libertyrms.info>)
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On Tue, Feb 12, 2002 at 11:49:26AM -0500,
  Andrew Sullivan <andrew@libertyrms.info> wrote:
> On Mon, Feb 11, 2002 at 07:39:38AM -0600, Bruno Wolff III wrote:
>
> > The way I did this for a tiny book database I have set up for my wife
> > to keep track of books is to have an edition table, an author table and
> > a table of edition author pairs. It isn't ordered, but it could be
> > by adding another field to the edition, author pairs.
>
> That was my original suggestion.  But then, how do you make sure that
> every edition has only one first author, only one second, &c.?  Also,
> you can't have a generic query which gets the authors for every book,
> and shows them in the tabular output that was originally desired
> (hence the pivot table).  You could, however, write some code outside
> the database which would first query the book_author table, figure
> out how many authors were necessary, and then build the real query
> that way.

I did have another suggestion in there about using a third column on
the author - book records to use for ordering. If you use something
like that you could write general queries using order by to get things
in author order.

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