Oracle-L: RE: Question about Constraint

From: Sinardy Xing <SinardyXing_at_bkgcomsvc.com>
Date: Fri, 29 Aug 2003 03:14:30 -0800
Message-ID: <F001.005CDF38.20030829031430@fatcity.com>

Hi,

Unique(companynumber, type)

you combine 2 columns together

CompanyNumber_Type (this can become primary key, I don't think you need the id column, pseudo column rownum is the same) You have lesser indexing

123_1
123_2

Sinardy

-----Original Message-----
Sent: 29 August 2003 18:24
To: Multiple recipients of list ORACLE-L

Sounds like 'Companynumber' and 'Type' should be either a compound Primary Key, or a unique index. Which begs the question of what 'Id' is doing - perhaps you don't need it.

peter

-----Original Message-----
Sent: Friday, August 29, 2003 10:39 AM
To: Multiple recipients of list ORACLE-L

Hallo,

I would like to gets ome help on this:

I have this table

Id Companynumber First Name LastName Type

1     123               Jim         Andersson   1
2     234               Tom         Perkins           2
3     565               Henry       Ford        1

I would like to have a constraint so when I try to add and the same companynumber that already exists(for instance 234) I am not allowed to do this if the filed Type has the value 1. So if I add a companynumber which already exists and the Type is 2, then I should be allowed to add this companynumber.

Maybe this is simple but woul dreally appreciate some help onhow to write this.

Roland

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Author: Robson, Peter
INET: pgro_at_bgs.ac.uk

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