what is the best solution for primary key

i'm using oracle forms , when i have in my database tables having primary key , number , should have incremental value by 1 record by record
when i have in a form : header & tabular blocks  based on main & sub tables
think now i'm in the header block , while inserting new record , what is the best trigger to use to set new value for the record ID , then so on for the tabular block ?
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Radek BaranowskiFull-stack Java DeveloperCommented:
IDENTITY column is now available on Oracle 12c version, see this:

                   c2 VARCHAR2(10));

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NiceMan331Author Commented:
i'm working on oracle 10g database , 6i developer
Mark GeerlingsDatabase AdministratorCommented:
Don't use a database trigger to provide the primary key value.  That can cause problems in Oracle Forms:  the users will get "record updated by another user" message if they ever try to change a record that was just inserted.  Use a pre-insert trigger in the header block to retrieve the next sequence value for the header record.  Use a pre-insert trigger in each child or detail block to retrieve the next sequence value for the primary key in each of those blocks.

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