RE: unique values across more than one column

2004-03-01 Thread Colin Williams
Hi, Could you just break out the email information into its own table? Then you could have columns like the following: UserID (foreign key), email (varchar), type (int: 1=primary email, 2=alias email). Then you can just have the email column defined as a unique index and relate the email to

Re: unique values across more than one column

2004-02-27 Thread Egor Egorov
Anand Buddhdev [EMAIL PROTECTED] wrote: I'm using mysql version 3.23.58, on Fedora core 1 (the default supplied on the system). I have searched the mailing list archives, and google, for my query, but have not yet found an answer. Does anyone know if it's possible to define 2 columns in

Re: unique values across more than one column

2004-02-27 Thread Anand Buddhdev
On Fri, Feb 27, 2004 at 12:58:14PM +0200, Egor Egorov wrote: I'm using mysql version 3.23.58, on Fedora core 1 (the default supplied on the system). I have searched the mailing list archives, and google, for my query, but have not yet found an answer. Does anyone know if it's

Re: unique values across more than one column

2004-02-27 Thread Egor Egorov
Anand Buddhdev [EMAIL PROTECTED] wrote: On Fri, Feb 27, 2004 at 12:58:14PM +0200, Egor Egorov wrote: I'm using mysql version 3.23.58, on Fedora core 1 (the default supplied on the system). I have searched the mailing list archives, and google, for my query, but have not yet found an

Re: unique values across more than one column

2004-02-27 Thread Alec . Cawley
Anand Buddhdev [EMAIL PROTECTED] wrote on 27/02/2004 11:26:41: The problem with first doing a select, and then an insert, is that there exists a race condition. Between the select and insert, someone else could insert a row which might cause a duplication. I have another solution, in

Re: unique values across more than one column

2004-02-27 Thread Anand Buddhdev
On Fri, Feb 27, 2004 at 01:54:13PM +0200, Egor Egorov wrote: Ok, thanks for the response. The problem with first doing a select, and then an insert, is that there exists a race condition. Between the select and insert, someone else could insert a row which might cause a duplication.

Re: unique values across more than one column

2004-02-27 Thread Michael Stassen
Anand Buddhdev wrote: On Fri, Feb 27, 2004 at 12:58:14PM +0200, Egor Egorov wrote: I'm using mysql version 3.23.58, on Fedora core 1 (the default supplied on the system). I have searched the mailing list archives, and google, for my query, but have not yet found an answer. Does anyone know if