I don't believe that you can check for overlapping interval within a database trigger. For that, you'd need two tables: one to enter interval and one to check against. Of course, the second table should also be populated, most likely by a 'AFTER INSERT' trigger.
> -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] > Sent: Tuesday, June 04, 2002 12:08 PM > To: Multiple recipients of list ORACLE-L > Subject: RE: Complex Integrity Checking > > > I'm reticent about putting the checking code in the application before > insert&update statement, although I'm not sure why. I'm just > thinking about > concurency and all the implications. > On the other hand I wanted to put the bussiness rules on the > database side. > Anyway, I'll use this approach, you told me, after all. > But what if after I check for overlapped intervals, but > before inserting, > another user insert another record with an interval extending > over mine. I > know it sounds crazy but I really like to know how this kind > of stuff are > implemented. That's the way the unique values constraint > work, I guess, and > I'd like to know more about it. > > iulian > > -----Original Message----- > Sent: Tuesday, June 04, 2002 6:24 PM > To: Multiple recipients of list ORACLE-L > > > 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 > > > > > > > ************************************************************** > ************** > > ** > > > > The information contained in this communication is confidential and > > may be legally privileged. 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