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UNION ORDER BY 00904. 00000 - "%s: invalid identifier"

976692Nov 28 2012 — edited Nov 28 2012
I'm using 11g R2 64bit
Why this does not execute ?

select 1 a from dual
union
select 2 from dual
union
select 3 from dual
order by a
;

ORA-00904: "A": invalid identifier
00904. 00000 - "%s: invalid identifier"
*Cause:
*Action:
Error at Line: 16 Column: 9

This works fine:
select 1 a from dual
union
select 2 a from dual
union
select 3 a from dual
order by a
;

And this works:
select 1 a from dual
union
select 2 from dual
--union
--select 3 from dual
order by a
;

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Locked on Dec 26 2012
Added on Nov 28 2012
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