Great, that works fine. I had tried it earlier i think (maybe incorrectly) but that was when i had the third column which had an identity with increment. Maybe that's why i couldn't get it to work.
:) Right, i'm off to bed (1.14am here). Only so much boring Live Big Brother i can stand to watch! Thanks for everyone's help tonight. Stuart On 15 Jul 2005, at 01:00, Ian Skinner wrote: > In table design, highlight all fields for the key and click the key > button. > > > -------------- > Ian Skinner > Web Programmer > BloodSource > www.BloodSource.org > Sacramento, CA > > "C code. C code run. Run code run. Please!" > - Cynthia Dunning > > ....-----Original Message----- > ....From: Saturday (Stuart Kidd) [mailto:[EMAIL PROTECTED] > ....Sent: Thursday, July 14, 2005 4:51 PM > ....To: CF-Talk > ....Subject: Re: 2 Primary Keys > .... > ....Just one other thing however, how do i create the compound key via > ....Enterprise Manager, can I do it through that? I'm on shared > hosting > ....with hostmysite.com. > .... > ....Thanks, > .... > ....Stuart > .... > .... > ....On 15 Jul 2005, at 00:52, Dave Watts wrote: > .... > ....>> I want to add a row in a join table which i don't want to be > ....>> duplicated ever. > ....>> > ....>> So i have my tableID, table1ID, table2ID - if table1ID = 24 > ....>> and table2ID = 35 i don't want there to ever be a > reoccurence of > ....>> them. I guess i have to set both of those fields (table1ID, > table2ID) > ....>> to primary keys, but how can i do that? Do i do it in ms- > sql or via > ....>> Coldfusion somehow? > ....>> > ....> > ....> As a bunch of people have already mentioned, you can create > ....> compound keys > ....> within your database. A compound key consists of more than one > ....> field. If you > ....> go that route, you really don't need the "tableID" field any > more > ....> (assuming > ....> that field is currently being used as your primary key) - you > can > ....> just make > ....> the combination of table1ID and table2ID your primary key. > ....> > ....> One disadvantage of this is that, if you have other tables > which are > ....> dependent upon this one, those tables will need to contain both > ....> fields for > ....> use as a foreign key. However, in all likelihood you don't > have any > ....> other > ....> tables which are dependent upon this one, but rather this > table is > ....> dependent > ....> upon two other tables - this kind of table is often called a > ....> linking or > ....> intersection table. The "middle" table in a many-to-many > relationship > ....> typically follows this pattern. > ....> > ....> Another disadvantage of this is that you won't be able to store > ....> historical > ....> relationship data - either a relationship exists now, or it > ....> doesn't. If you > ....> do want to store historical data, you'd need to keep the current > ....> "tableID" > ....> as your primary key, or add a third field to your two-field > primary > ....> key - > ....> the value of that third field would have to be different for any > ....> two rows > ....> that have the same values for the other two fields. > ....> > ....> > ....>> If i do it via MS-SQL then won't it pop an error up in the > code if > ....>> it happens? > ....>> > ....> > ....> Yes, like any other invalid query you might run. It's up to > you to > ....> catch and > ....> resolve those errors appropriately within your code. > ....> > ....> Dave Watts, CTO, Fig Leaf Software > ....> http://www.figleaf.com/ > ....> > ....> Fig Leaf Software provides the highest caliber vendor-authorized > ....> instruction at our training centers in Washington DC, Atlanta, > ....> Chicago, Baltimore, Northern Virginia, or on-site at your > location. > ....> Visit http://training.figleaf.com/ for more information! > ....> > ....> > ....> > .... > .... > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~| Logware (www.logware.us): a new and convenient web-based time tracking application. Start tracking and documenting hours spent on a project or with a client with Logware today. Try it for free with a 15 day trial account. http://www.houseoffusion.com/banners/view.cfm?bannerid=67 Message: http://www.houseoffusion.com/lists.cfm/link=i:4:211947 Archives: http://www.houseoffusion.com/cf_lists/threads.cfm/4 Subscription: http://www.houseoffusion.com/lists.cfm/link=s:4 Unsubscribe: http://www.houseoffusion.com/cf_lists/unsubscribe.cfm?user=89.70.4 Donations & Support: http://www.houseoffusion.com/tiny.cfm/54
