On Thu, Apr 22, 2004 at 16:46:31 -0400,
  Glenn MacGregor <[EMAIL PROTECTED]> wrote:
> 
> No problem this works great!
> 
> Now I have changed my data to
> 
> vid   vname           parentname
> 1     [EMAIL PROTECTED]
> 2     [EMAIL PROTECTED]       n1
> 3     [EMAIL PROTECTED]       n1
> 4     [EMAIL PROTECTED]       n1
> 5     [EMAIL PROTECTED]       n3
> 
> Can I change my delete cascade constraint to do this substring query 
> instead of an exact match?

No.

> Is there anyway to accomplish what I need to do?

If the local part of the email address is a candidate key, separate it
from the domain name and make it the primary key.

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