Re: Condition in a calculated field

I just watched the documentation and did what you suggested but I am still
getting the same error message. I did the following test, what is wrong?

SELECT
facturas.fce_id,
facturas.fce_numero_factura,
facturas.fce_fecha,
compradores.com_nombre,
facturas.fce_subdivision,
facturas.fce_valor_comercial,
SUM(facsub.fce_valor_comercial) AS total
FROM
trafico.facturas_exportacion facturas
INNER JOIN trafico.cat_compradores compradores ON (facturas.fce_comprador
= compradores.com_clave)
INNER JOIN trafico.facturas_exportacion facsub ON (facturas.fce_id =
facsub.fce_id_factura_original)
WHERE
facturas.fce_subdivision = true
HAVING
facturas.fce_valor_comercial > total
GROUP BY facturas.fce_id,compradores.com_clave

On Tue, Sep 9, 2014 at 1:48 PM, David G Johnston <david(dot)g(dot)johnston(at)gmail(dot)com
> wrote:

> JORGE MALDONADO wrote
> > Can I use a calculated field in a WHERE condition of a SELECT statement?
> I
> > get a "column 'total' does not exist" error when I run the statement
> > below.
> > 'total' is a field generated by a SUM and I want to use it in the WHERE
> > condition.
> >
> > SELECT
> > facturas.fce_id,
> > facturas.fce_numero_factura,
> > facturas.fce_fecha,
> > compradores.com_nombre,
> > facturas.fce_subdivision,
> > facturas.fce_valor_comercial,
> > SUM(facsub.fce_valor_comercial) AS total
> > FROM
> > trafico.facturas_exportacion facturas
> > INNER JOIN trafico.cat_compradores compradores ON
> > (facturas.fce_comprador
> > = compradores.com_clave)
> > INNER JOIN trafico.facturas_exportacion facsub ON (facturas.fce_id =
> > facsub.fce_id_factura_original)
> > WHERE
> > facturas.fce_subdivision = true AND facturas.fce_valor_comercial >
> total
> > GROUP BY facturas.fce_id,compradores.com_clave
> >
> > Respectfully,
> > Jorge Maldonado
>
> WHERE clause is pre-grouping.
>
> What you want is the HAVING clause - though you have to repeat the
> expression (e.g., col > sum(...) ) as opposed to referring to it by name
> (e.g., col > total).
>
> http://www.postgresql.org/docs/devel/static/sql-select.html
>
> David J.
>
>
>
>
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