Re: Creating assertions on oracle 10g
Date: Sun, 1 Nov 2009 06:54:14 -0800 (PST)
On Nov 1, 2:18 am, "The Boss" <use..._at_No.Spam.Please.invalid> wrote:
> Vladimir M. Zakharychev wrote:
> > On Oct 31, 1:50 pm, Pedda <hemanth.6..._at_gmail.com> wrote:
> >> Hi,
> >> I am working on Oracle 10g Database.
> >> I am trying to create an assertion in Oracle 10g but it is displaying
> >> an error message
> >> I use the following command to create an assertion in 10g but it is
> >> not working.
> >> CREATE ASSERTION AST1(SELECT COUNT(*) FROM EMP + SELECT COUNT(*) FROM
> >> DEPT>SELECT COUNT(*) FROM EMP_DEPT);
> >> Please let me know any changes to the above command so that the above
> >> assertion works in Oracle10g
> >> Thanks,
> >> Hemanth
> > Why do you expect it to work? In which Oracle SQL reference manual did
> > you find this CREATE ASSERTION command? Even 11g R2 doesn't have it,
> > nor any previous release. Indeed, it's part of the SQL-92 standard,
> > but to the best of my knowledge, no commercial RDBMS product ever
> > implemented it. You can possibly implement an equivalent to assertion
> > in Oracle as a statement level trigger or a check constraint on a
> > refresh-on-commit materialized view.
> > Regards,
> > Vladimir M. Zakharychev
> > N-Networks, makers of Dynamic PSP(tm)
> > http://www.dynamicpsp.com
> Here's a nice thread on AskTom on the subject:http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:6...
> I like the comment made by an anonymous reader:
> we need a
> CREATE ASSERTION no_internal_oracle_error AS CHECK
Nah, would be violated way too often... Besides, they do implement what they promise, but with loads of unexpected side effects aka bugs...
Vladimir M. Zakharychev
N-Networks, makers of Dynamic PSP(tm) http://www.dynamicpsp.com Received on Sun Nov 01 2009 - 08:54:14 CST