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In an employee management system, which concept is used to uniquely identify each employee within a table?
Schema
Foreign key
Primary key
Field/column
In a relational database, a Primary key is used to uniquely identify each record in a table. This ensures that there are no duplicate records for any given entity and that each can be uniquely accessed. A Field/column is a different concept referring to an individual piece of data in a record, such as an employee's name or address. A schema defines the overall structure of the database, including tables and their relationships, but it itself does not uniquely identify records. A foreign key is a field in one table that uniquely identifies a row of another table, but it does not necessarily provide uniqueness within its own table.
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