When you create a table (subTable) which enherits from an other table (superTable), 
what are the actual relationship between theese tables. 

Is there a foreign key in the subTable, or does the subTable just have the same 
columns as the superTable plus some extra?

I am askin because I would like to illustrate the tables in a ER-diagram.

Regards Peter.

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      joining column's datatypes do not match

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