Description: Example code showing how to add a primary constraint. This Oracle constraint is used to identify the primary key for a table.
A primary key is a single field or combination of fields that uniquely defines a record. None of the fields that are part of the primary key can contain a null value. A table can have only one primary key.
This operation requires that the primary columns are unique, and this Oracle constraint will create a unique index on the target primary key.
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