Computer Science for IGCSE & O level - Databases (Section 2 - No. 43)
What is the purpose of a 'foreign key' in a database?
To uniquely identify records within a table.
To create relationships between tables.
To define the primary key for a table.
To sort the data in a table.
คำอธิบาย
A foreign key establishes a link between tables by referencing the primary key of another table, enabling relational database functionality.