How to make or set this as autonumber in msaccess-vb database?
from 00-00-00 up to 9999-9999-9999

how to make that code to become autonumber?


and

what code can i use in my database when the new entry is equal to existing ?(The same primary key)

You cannot do this as autonumber, it utilises a long integer data type. If you are adding the data using a form you can add code to the Before_Insert event to generate the number for you.

if you moved to SQL-Server for the database engine you could add a trigger to the database to achieve the same thing at the database level.

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