Re: mistake, error, or something else ?

Daniel Morgan wrote:
>
> mbrugo_at_despammed.com wrote:
>
> >Hi people.
> >I've this query:
> >
> >select a,b,c from t1
> >where c in (select distinct c from t2);
> >
> >
> >this query run succesfully BUT:
> >
> >select distinct c from t2
> >give me: ora-904 Invalid column name.
> >
> >WHY ????
> >
> >i've no synonym or other objects
> >
> >t1 has 3 columns, a,b,c
> >t2 has 2 columns d,e
> >
> >Tia
> >
> >Mike
> >
> >
> Which part of "t2 has 2 columns d,e" would lead you to believe that
> "select distinct c from t2" would be successful?
>
> --
> Daniel Morgan

But it is 'sucessful'. Well it won't retrieve anything, but it's valid syntax.

(select distinct c from t2)

in this sub query is the same as

(select distinct t1.c from t2)

and that's legal, but fairly useless code. Received on Mon Oct 27 2003 - 08:26:26 CST