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                                [EMAIL PROTECTED]
Isle of Wight, UK                             http://www.lfix.co.uk/oliver
GPG: 1024D/3E1D0C1C: CA12 09E0 E8D5 8870 5839  932A 614D 4C34 3E1D 0C1C
     "But the LORD is in his holy temple; let all the earth 
      keep silence before him."           Habakkuk 2:20 

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