Update Key and Primary Key

Hi
When I am trying to define Update Key which is the other name for Alternate Key, then the primary key symbol (key) which is defined just beside my primary key column ( customer id) gets dissappeared and the new key symbol comes up besides the update key columns("marital status,salary and address")
Now why this happens and how to tackle.
In my project Customer id is a primary key which is responsible for insert of new records if not already presnt in the target table and the three other fields "marital status,salary and address" columns are responsible for update but these are not primary or composite keys.

Can anyone tell me the difference in terms of how oracle update mechanism work in both the case.Not sure what you're asking.
Have you done an explain plan for each statement?

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