Computer Science for IGCSE & O level - Databases (Section 1 - No. 11)
What is the purpose of a primary key in a database table?
To store the largest values in the table.
To identify a record uniquely.
To define the data type of a field.
To sort the records in alphabetical order.
स्पष्टीकरण
A primary key uniquely identifies each record in a table.