Re: [Q] Why cant I ORDER BY on a SELECT...UNION in PL/SQL

In article <888240456.3424.0.nnrp-06.9e98628b_at_news.demon.co.uk>,   "Quentin
North" <quentinn_at_epic.co.uk> wrote:
>
> Why wont this work in pl/sql (but

 will otherwise):
>
> select col1,col2 from tab1
> union
> select col1,col2

 from tab2
> order by col1;
>
> Get message PLS-00423: ORDER BY item must be
 the number of a SELECT-list
> expression
>
> Oracle support in the UK dont
 appear to know why it wont work. Everything
> works until you add the order
 by clause.
>
>

[Quoted] Try using the position of the column instead of the name. In your example,

select col1,col2 from tab1
union
select col1,col2 from tab2
order by 1

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