Computer Science for IGCSE & O level - Databases (Section 4 - No. 2)
What is the purpose of a primary key in a database table?
To sort the data in the table.
To uniquely identify each row (record) in the table.
To create relationships between different tables.
To store an image of the database.
解释
The primary key ensures the uniqueness of each record in a table, serving as a unique identifier.