wouldn't an "INSTEAD OF" trigger solve the problem here? that way, he could
program an insert/update any way he wants to...
Tom Mercadante
Oracle Certified Professional
-----Original Message-----
Sent: Tuesday, June 04, 2002 4:26 PM
To: Multiple recipients of list ORACLE-L
I think that something such as
insert into my_table
select new_start_time, new_end_time (both constants)
from dual (well known view on x$dual)
where not exists (select null
from my_table
where new_start_time between start_time and end_time
union
select null
from my_table
where new_end_time between start_time and end_time)
should do the trick, making of course wildly optimistic assumptions
about indices etc.
And you can always check SQL%WHATITSNAME for the number of row
processed if you need to keep track of rejects.
Rachel Carmichael wrote:
>
> maybe I'm being simplistic and I know this will impact performance but
> why not simply do a select to see if the condition exists before the
> insert or update?
>
> --- [EMAIL PROTECTED] wrote:
> > I said something like "the way the unique constraints work".
> > Ok. Here's my context.
> > I have a table say intervals and 2 columns start_time and end_time.
> > I want to check for overlapped intervals.
> > I know what conditions to check but I can't implement them.
> > Thanks!
> >
> > iulian
> >
> > -----Original Message-----
> > Sent: Tuesday, June 04, 2002 5:13 PM
> > To: Multiple recipients of list ORACLE-L
> >
> >
> >
> **********************************************************************
> > This email has been tested for viruses by F-Secure Antivirus
> > administered by IT Network Department.
> >
> **********************************************************************
> >
> >
> > Hi
> >
> >
> > if unique does not suit your need what exactly do you need to check?
> > duplicates: use primary key
> >
> >
> > Jack
> >
> >
> >
> >
> > Iulian.ILIES@oran
> >
> > ge.ro To: Multiple
> > recipients
> > of list ORACLE-L <[EMAIL PROTECTED]>
> > Sent by: cc: (bcc: Jack
> > van
> > Zanen/nlzanen1/External/MEY/NL)
> > [EMAIL PROTECTED] Subject: Complex
> > Integrity
> > Checking
> >
> >
> >
> >
> > 04-06-2002 15:58
> >
> > Please respond to
> >
> > ORACLE-L
> >
> >
> >
> >
> >
> >
> >
> >
> > Hi guys. Here's my problem.
> > I want to check the new values (when inserting&updating a table)
> > against
> > the
> > ones in the existing rows. Something like checking for duplicate
> > values,
> > but
> > using a unique constraint doesn't suit my needs.
> > I think of a before insert&update trigger, wherein checking my
> > condition
> > and
> > raise a error if not valid. The problem is, in case of an update
> > statement,
> > I get the mutating "ORA-04091 table <my table> is mutating....".
> > I read a lot of doc but I didn't find any helping ideas. Can you give
> > me
> > some, or maybe a new approach to this kind of problem?
> > Thanks in advance!
> >
> > iulian
> >
--
Regards,
Stephane Faroult
Oriole Software
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Author: Stephane Faroult
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