Re: Fw: Is SQL silly as an RDBMS<->app interface?

You could do something like:

    retrieve (a.dept, x=sum(a.total by a.dept) / sum(a.total));

if I remember correctly.

---------------------------------------------------------------------------

Vincent Hikida wrote:
>
> ----- Original Message -----
> From: "Bruce Momjian" <pgman@candle.pha.pa.us>
> To: "elein" <elein@varlena.com>
> Cc: "Jan Wieck" <JanWieck@Yahoo.com>; "Vincent Hikida"
> <vhikida@inreach.com>; <pgsql-general@postgresql.org>
> Sent: Thursday, July 24, 2003 5:35 PM
> Subject: Re: Fw: [GENERAL] Is SQL silly as an RDBMS<->app interface?
>
>
> >
> > Yes, it was more powerful because you could do aggregates in the query
> > independent of the results returned by the query.
> >
> > The 'by' feature of aggregates always confused me because it would
> > modify the aggregate WHERE clause (that was independent of the outer
> > query) and restrict the aggregate to only process rows where the outer
> > query's column value matched the same column's value in the aggregate.
> >
>
> Actually, I used a hierarchical/relational DBMS called Nomad in 1981. If I
> understand Bruce, Nomad could do the same thing. I could aggregate at
> different levels in the same query. Each aggregate created a break and I
> could add whatever code I wanted at the level. I could also refer to any
> level of aggregate in the rest of the query. I could also refer to any level
> aggregate in the rest of the code. This meant that I could for example
> calculate what percentage of the total the individual row was. The only
> problem was that I could only join two tables at a time so if I wanted to
> join several tables I had to have several statements. Each statement created
> an intermediate table which was easy to refer to in subsequent statements.
>
> Vincent
>
>
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