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In a database table, `doctor_id` is a field used to uniquely identify each doctor record. It is generally defined as an integer (`INT`) column and assigned as the Primary Key of the table. The primary key ensures that every doctor has a unique identification number and prevents duplicate or null values in this column. The definition can be written in SQL as: ```sql doctor_id INT PRIMARY KEY AUTO_INCREMENT ``` Here, `doctor_id` is the name of the column. The `INT` data type indicates that the column stores integer values such as 1, 2, 3, 4, and so on. Since doctor identification numbers are normally _______ ________ ____ _____ ________ ____.
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