[AccessD] sorting query on 'named' collumn and use 'named'collumn in where criteria of a query

Which query will run first, the source (sub)query with the functions (and no
WHERE statement, so no filtering) or the main query with select and
filtering?
Because if the query with the calculatins runs first the gain in speed maybe
will be little, because then the calculations (functions) will run for all
records...

Bert-Jan

----- Original Message ----- 
From: "Andy Lacey" <andy at minstersystems.co.uk>
To: "Access Developers discussion and problem solving"
<accessd at databaseadvisors.com>
Sent: Friday, June 18, 2004 10:46 AM
Subject: Re: [AccessD] sorting query on 'named' collumn and use
'named'collumn in where criteria of a query


> Hi Bert-Jan
> No you can't, but what you can do is write a SELECT query which gets you
the
> fields you want plus the calculated values, then make this the source of
> your existing query rather than the original table. Because the calculated
> values are already in the source you can then refer to them as many times
as
> you like.
> --
> Andy Lacey
> http://www.minstersystems.co.uk
>
>
>
> --------- Original Message --------
> From: Access Developers discussion and problem solving
> <accessd at databaseadvisors.com>
> To: accessd at databaseadvisors.com <accessd at databaseadvisors.com>
> Subject: [AccessD] sorting query on 'named' collumn and use 'named'
collumn
> in where criteria of a query
> Date: 18/06/04 07:56
>
> >
> > Dear list,
> >
> > in qeuries i use a lot of functions to format a value, or to get
> > 'calculated' values, these functions get 'named' collumns (like .... AS
> > clientnumber). This works fine.
> > However when i want to use this named collumn in the WHERE - statement
or
> in
> > the ORDER BY statement and i use the collumn name this doesn't work. Ik
i
> > use the same function again in the WHERE and ORDER BY statement this
works
> > fine, but it slows down the qeury, because the function has to be
executed
> > more times.
> > Can i use the named collums in the WHERE and ORDER BY statement and if
so
> > how do i do that?
> >
> > I am working with A2k on WINXP and WIN2kProffesional
> >
> > Thanks.
> >
> > Bert-Jan
> >
> > --
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> >
> >
> >
>
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