[BUGS] upper() don't work with field-alias in the order by part of select statement.

[Wjatscheslaw W�chter]

I need in some select-statements case-insensetiv ordering of results,
i want to use upper()-function in order by part of statement but it
doesn't work with field-aliases.
Can I do this in another way?
I'm using PostgreSql 7.1.2 on SuSe-Linux

Example:
    this works:
    select p1.prs_vorname as vorname, p1.prs_nachname as nachname,
           p1.lfdnr as lfdnr, pos.pos_name as position,
           p1.prs_email as email, abt.abt_name as abteilung
    from person p1 left join abteilung abt
           on abt.lfdnr = p1.prs_abt_lfdnr,
         person p2 left join positionen pos
           on pos.lfdnr=p2.prs_pos_lfdnr
    where   p1.lfdnr=p2.lfdnr
    ORDER BY nachname;

    this don't work:
    select p1.prs_vorname as vorname, p1.prs_nachname as nachname,
           p1.lfdnr as lfdnr, pos.pos_name as position,
           p1.prs_email as email, abt.abt_name as abteilung
    from person p1 left join abteilung abt
           on abt.lfdnr = p1.prs_abt_lfdnr,
         person p2 left join positionen pos
           on pos.lfdnr=p2.prs_pos_lfdnr
    where   p1.lfdnr=p2.lfdnr
    ORDER BY upper(nachname);

    ERROR:  Attribute 'nachname' not found



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