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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