Computer Science for IGCSE & O level - Databases (Section 4 - No. 1)
In the context of database design, what is the primary purpose of a primary key?
To store data values.
To uniquely identify each record in a table.
To define the data types of fields.
To establish relationships between tables.
Giải thích
The primary key's purpose is to uniquely identify each record, ensuring data integrity.