Computer Science for IGCSE & O level - Databases (Section 1 - No. 39)
What is the purpose of a primary key in a database?
To store large amounts of text data.
To uniquely identify each record in a table.
To define the relationships between tables.
To provide default values for fields.
คำอธิบาย
The primary key is used to uniquely identify each record, ensuring data integrity.