Re: View getting invalidated

In article <aa3rgr$t4s$1_at_news.vsnl.net.in>, "Yash says...
>
>Hi,
>I have 2 tables A and B. The schema of both is identical. A view V is
>defined as ( select * from A union all select * from B).
>If I drop a particular column from both A and B, the view V is left
>invalidated. The Oracle documentation also says so. Any view that depends on
>a table that has been altered, remains invalidated till it is recompiled.
>
>So I did a : alter view V compile.
>This command succeeded.But the view did not get validated.
>
>Can anyone guess why this happens? One would expect the query to be
>reevaluated after recompilation. Since there is a select *, it should work
>fine. But it doesn't. Can someone suggest something?
>
>Thanks
>Yash
>
>

problem is a view like:

select * from t;

is expanded into

select "C1", "C2", "C3", ... from t;

when you recompile it, after dropping C3, it won't work.

select * is a dangerous thing to use, in code, in triggers.

--
Thomas Kyte (tkyte@oracle.com)             http://asktom.oracle.com/ 
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