at you always either
    write <TT
CLASS="LITERAL"
>AS</TT
> or double-quote the output column name.
   </P
><DIV
CLASS="NOTE"
><BLOCKQUOTE
CLASS="NOTE"
><P
><B
>Note: </B
>     The naming of output columns here is different from that done in
     the <TT
CLASS="LITERAL"
>FROM</TT
> clause (see <A
HREF="queries-table-expressions.html#QUERIES-TABLE-ALIASES"
>Section 7.2.1.2</A
>).  It is possible
     to rename the same column twice, but the name assigned in
     the select list is the one that will be passe