define primary key .
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A database table must have a primary key for Optim to insert, update, restore, or delete data from a database table. Optim uses primary keys that are defined to the database.
A primary key is the column or columns that contain values that uniquely identify each row in a table.
A primary key is critical to the operations of an RDBMS. A single table contains thousands of records, including duplicates. Therefore, it’s imperative to use a primary key or closely related foreign key to ensure no record is ever duplicated and is always uniquely identified.