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In a DBMS Lab, the attribute appointment_id is used as a unique identifier for storing and managing appointment records in a database table. It is defined as a Primary Key with the data type INT and configured as Auto Increment. This ensures that every appointment entry receives a distinct numerical value automatically when a new record is inserted into the table. A Primary Key is an important concept in a relational database because it uniquely identifies each row of a table. No two records can have the same primary key value, and it cannot ______ ________ ___ ______ _______ _____ _______ __________ __________.
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