Modelling databases in Oracle Designer environment

Today I had laboratory's which subject was: "Modelling data and designing databases scheme in Oracle Designer environment" and I have to make a report for tommorow. I can't find some answers for questions which our Professor told us to include in the report. I would be very grateful if enyone here can help me.
1) How looks in SQL code definition of the key of the table if relationship have PRIMARY UID attribute?
2) Is there any difference in SQL code between references replying to transferable and not transferable relationships
3) Why some tables have more columns than number of attributes in entities (entities contains the same things that tables)?
My english isn't perfect, sorry for that. But I hope that I wrote that wuestions correctly.
Thanks for any help.

1) a primary UID is a primary key in SQL
2) No.
3) OD entity models don't include inherited referential key attributes, whereas the SQL tables (obviously) require them.

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