Computer Science for IGCSE & O level - Databases (Section 5 - No. 34)
In database validation, what is the purpose of a 'presence check'?
To ensure a field is formatted correctly.
To verify that a field contains a value.
To check if a value falls within a specific range.
To enforce a specific length for the data in a field.
설명
A presence check verifies that a field is not left empty or null, ensuring that data is present.