Re: UNIQUE not unique with inheritance (workaround?)

On Sat, 2003-02-08 at 19:34, Samuel Sieb wrote:
> Is there any workaround for this problem?  I'm getting involved in a 
> project where inheritance is an incredibly useful feature, but the 
> non-unique issue could be a serious stumbling block.  Is there any way 
> to work around it with a trigger or something?

Give each table in the hierarchy a foreign key reference to another
table which holds a unique list of the primary keys and a column that
says which table they are in.  Use triggers to update this other table
and to prevent duplications in the hierarchy.

.
-- 
Oliver Elphick                                Oliver.Elphick@lfix.co.uk
Isle of Wight, UK                             http://www.lfix.co.uk/oliver
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