Create View that only Returns Data when user supplies predicate

From: Rumpi Gravenstein <>
Date: Fri, 23 May 2008 19:56:51 -0400
Message-ID: <>

We have a problem where a we have created views for users to query data. When our end users query the view with a 1 day date range everything works well, and the query returns in a few seconds. Unfortunately users don't always supply a predicate. When that happens things take a very long time.

What I'm wondering is if there is a standard way to force users into supplying a predicate to the query. At the end of the day what I want is a view that returns an error when it's queried with inappropriate conditions. This is on 10gR2. I've been puzzling over the challenge and think I can come up with a way to do this using a function in the underlying view predicate that throws an error when the appropriate conditions aren't supplied. Before I go through the work of creating that function I thought I'd ask here to see if someone has done something like this before or if there is a better alternative.

To recap.

I have a complicated view x_vw with a lot of columns, one of which is a date column. What I'd like to do is have this query throw an error:

  FROM x_vw

and have this query run to completion

  FROM x_vw
WHERE x.vw.date_column between TRUNC(SYSDATE) and TRUNC(SYSDATE)+1

Just one comment, I know that you can define resource limits. I'd like to avoid that approach as I think it better to stop the query right at the start and not after it has "wasted" a lot of system resources.

Thanks in advance.


Rumpi Gravenstein

-- Received on Fri May 23 2008 - 18:56:51 CDT

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