Re: Disallow access to column of a table

On 05/10/2009, Jeffrey Beckstrom <JBECKSTROM@xxxxxxxxx> wrote:
>
>
> We have a requirement to disallow access to a few columns of a table.  Any
> suggestions on how to do this?

If it's just one table then a view is the way to go.  If the column to
be hidden is a non-mandatory one (or mandatory but has a default) then
the view can even be updateble if needed.  Give the users access to
the view but not the table.

An alternative, which may be useful or necessary in some situations,
might be to provide access through a package.  That way you can
control access via the code.  This is a definite case of only do if
there is a definite advantage.  It would however resolve the issue
Chet mentions of wanting users to be able to use information in a
lookup or insert data into a table but not then be able to extract the
data or only be able to extract it in a munged form.  You could
implement this in the front end application logic but by putting it in
a database package you can make sure it's enforced if someone access
the data using another tool.

Obviously all these precautions are only effective if users are not
accessing the database as the table owner, i.e. they login as a
different user which has been granted permissions on the table owners
objects.

Stephen

-- 
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