Re: syntax for access an alias in the where clause ?

On Wed, Jun 19, 2002 at 11:13:31PM +0200, Michael Agbaglo wrote:
>
>
> Wei Weng wrote:
>
> >Is it allowed to use spaces in postgresql alias?
> >
> >Why dont you try to use alias1 instead of "alias 1"?
>
>
>
> really amusing... muhahaha...

I'm sure he didn't mean to make a joke, nor ridicule you, it was just a
misundertanding.

> I don't use the brackets either... I didn't assume that you might be
> interested in how the expression looks like or what aliases I'm using...

Sometimes, it makes all the difference. In this case, it doesn't. Aliases
are not available in the 'order by' clause: you need to repeat te full
expressions there.

Ross

>
>
> >
> >
> >On Wed, 2002-06-19 at 14:03, Michael Agbaglo wrote:
> >
> >>Hi !
> >>
> >>It's long ago since I used SQL :-)
> >>
> >>select [expression 1] as [alias 1], [expression 2] as [alias 2]
> >>where [alias 1] < [alias 2]
> >>order by [alias 2] - [alias 1]
> >>
> >>---> ERROR: Attribute '[alias 1]' not found
> >>
> >>I found a lot of 'select [expression] as' but I've never seen somebody
> >>accessing the alias ... Can't this be done ?
> >>
> >>M.
> >>
> >>
> >>
> >>
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