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

The WHERE clause is evaluated before the SELECT list,
at which point the value of "[alias 1]" is not known. 
You will need to use "[expression 1]" there instead.

ORDER BY is evaluated after the SELECT, so "[alias 1]"
can be used there with no problems.

--- Michael Agbaglo <byteshifter@shifted-bytes.de>
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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