On Monday 18 August 2003 13:04, Darko Prenosil wrote:
> On Monday 18 August 2003 10:20, Hervé Piedvache wrote:
> > Hi,
> >
> > May be my question is stupid ... but I'm a little suprised :
> >
> > SELECT id_letter as letter from my_table;
> >
> > letter
> > -----
> > B
> > C
> > a
> > A
> >
> > SELECT id_letter as letter from my_table order by letter;
> >
> > letter
> > -----
> > A
> > B
> > C
> > a
> >
> > SELECT id_letter as letter from my_table order by lower(letter);
> >
> > ERROR: Attribute "letter" not found
>
> Why did you change column name to "letter" in last query, and all the other
> queries have "id_letter" as column name. What is table structure exactly ?
> I assume that You don't have column with "letter" at all.
>
> Regards !
OK, now I see exactly the mistake You are making:
SELECT id_letter as letter from my_table order by lower(id_letter);
would be correct query, because "letter" is only alias for result column, not
column in "my_table". Sorry I didn't see it first time.
Regards !
---------------------------(end of broadcast)---------------------------
TIP 9: the planner will ignore your desire to choose an index scan if your
joining column's datatypes do not match
