[Zope-DB] ZSQL, sum() and you

Russell Hires rhires@earthlink.net
Mon, 3 Sep 2001 09:27:13 -0400

This is a suggestion and a question as I'm a relative Zope Newbie and an SQL 
Newbie while I'm at it...

Why not have zope look at the figures returned in the column, and just add 
'em up and then divide by the number of times it had a number to go through? 
Each row.column is an object, right? Is it possible to get the object's 
value, and then add it, like a "for" loop, but in DTML?

Hope this is helpful, and if not, I hope I get a good answer myself!


On Monday 03 September 2001 03:43, Mitch Pirtle wrote:
> > Scavenging the mail folder uncovered Mitch Pirtle's letter:
> > > Imagine, if you will, a ZSQL method called dbGetEmp
> >
> > containing "select
> >
> > > * from emp"; and want to also retrieve sum(salary).  This is with
> > > tables in MySQL.  For the life of me, I cannot find any summing
> > > features in Zope - do I gotta do this in Python just to get
> >
> > a total on
> >
> > > one column?
> >
> > maybe i don't understand correctly the problem, but wouldn't...
> >
> >       SELECT *, sum(salary) as sum_of_salary FROM emp
> >
> > do it?
> Not in MySQL, and I believe/think/ASSume that's illegal SQL.  (cannot
> include GROUP statements within a non-GROUP query or something of the
> sort).
> Basically, I'm returning all rows from a table, and then wanting a sum
> from one column.  In PHP, you run the query, display (via loop) the
> rows, then calculate the sum of one column (from the same recordset,
> without re-running the query).  I cannot figure out the equivalent in
> DTML, and am not excited to use python just to get a total.
> I know how to do this in PL/SQL, but no Oracle here - is there a ZSQL
> equivalent?
> Anybody else out there?  Bueller?
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