Обсуждение: Referencing named attribute in where clause doesn't work with 7.1.2?

Hi, this is my first post to this list so please...
I have problems getting this query to work, any ideas?

select article.title_text_key,
(select on_text.text_value from on_text whereon_text.text_key = title_text_keyAND NOT title_text_key is NULLAND
on_text.lang_id= (select code.id from code, code_group where     code.code_group_id = code_group.id      AND
code_group.description= 'lang' AND code.code_key = 'lang.NO'      ))
 
as title_text_value from article where NOT title_text_value is NULL;

ERROR:  Attribute 'title_text_value' not found

Issuing the same query without the where-clause does work tho, but
return tupples with null in them which I don't want.

--
Andreas Joseph Krogh <andreak@officenet.no>

On Wed, 8 Aug 2001, Andreas Joseph Krogh wrote:

> Hi, this is my first post to this list so please...
> I have problems getting this query to work, any ideas?
> 
> select article.title_text_key,
> (select on_text.text_value from on_text where
>     on_text.text_key = title_text_key
>     AND NOT title_text_key is NULL
>     AND on_text.lang_id = (select code.id from code, code_group where
>          code.code_group_id = code_group.id
>           AND code_group.description = 'lang' AND code.code_key = 'lang.NO'
>           )
>     )
> as title_text_value from article where NOT title_text_value is NULL;
> 
> ERROR:  Attribute 'title_text_value' not found

Hallo Andreas,

Relocating your AS clause to the topmost string?  BTW, table aliasing
would make for less typing.

Best of luck!

> Issuing the same query without the where-clause does work tho, but
> return tupples with null in them which I don't want.
> 
> --
> Andreas Joseph Krogh <andreak@officenet.no>
> 
> ---------------------------(end of broadcast)---------------------------
> TIP 4: Don't 'kill -9' the postmaster
> 


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Thomas Good wrote:
> 
> On Wed, 8 Aug 2001, Andreas Joseph Krogh wrote:
> 
> > Hi, this is my first post to this list so please...
> > I have problems getting this query to work, any ideas?
> >
> > select article.title_text_key,
> > (select on_text.text_value from on_text where
> >       on_text.text_key = title_text_key
> >       AND NOT title_text_key is NULL
> >       AND on_text.lang_id = (select code.id from code, code_group where
> >            code.code_group_id = code_group.id
> >             AND code_group.description = 'lang' AND code.code_key = 'lang.NO'
> >             )
> >       )
> > as title_text_value from article where NOT title_text_value is NULL;
> >
> > ERROR:  Attribute 'title_text_value' not found
> 
> Hallo Andreas,
> 
> Relocating your AS clause to the topmost string?  BTW, table aliasing
> would make for less typing.
> 
> Best of luck!

I don't get it, what do you mean by "Relocating your AS clause to the
topmost string"?

--
Andreas Joseph Krogh <andreak@officenet.no>

Andreas Joseph Krogh writes:

> Hi, this is my first post to this list so please...
> I have problems getting this query to work, any ideas?
>
> select article.title_text_key,
> (select on_text.text_value from on_text where
>     on_text.text_key = title_text_key
>     AND NOT title_text_key is NULL
>     AND on_text.lang_id = (select code.id from code, code_group where
>          code.code_group_id = code_group.id
>           AND code_group.description = 'lang' AND code.code_key = 'lang.NO'
>           )
>     )
> as title_text_value from article where NOT title_text_value is NULL;
>
> ERROR:  Attribute 'title_text_value' not found

The select list is not in scope for the where clause.  Basically, the
order of processing and approximately the nesting of scopes is:

from -> where -> group -> having -> select -> order

Any names generated by an element on the right cannot be in scope in
elements on the left.  (In some cases it might work as a convenience
anyway, but not in your case.)

I think you might be better off writing this query as a proper join
anyway.

-- 
Peter Eisentraut   peter_e@gmx.net   http://funkturm.homeip.net/~peter