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State the relationship and difference between a primary key and foreign key. 4 marks

Posted by Thetheng Haokip 3 years, 2 months ago

CBSE > Class 10 > Information Technology (402)

1 answers

Vishwaraj Aryan 3 years, 2 months ago

A primary key acts as a unique identifier for each record means it uniquely identifies each row/record in a table. "A foreign key" is a field in one table that relates the tables together. The primary key attributes cannot have NULL values however; a foreign key can have a NULL value.

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