Data Validation Quiz

What is the main purpose of data validation in a database?

• To allow only accurate and meaningful data to be entered

• To automatically correct errors in the data

• To prevent users from modifying the database

• To speed up data entry

Why does an error message appear when a validation rule is violated?

• To delete the incorrect entry

• To prevent users from re-entering data

• To allow users to fix mistakes

• To notify the database administrator

Which validation method ensures that a field cannot be left empty?

• Presence check

• Format check

• Length check

• Type check

What does a length check validate?

• The number of characters in the data

• The uniqueness of data

• That data follows a specific pattern

• That data falls within a defined numerical range

Which validation rule ensures that a value stays within a specified limit, such as between 1 and 100?

• Range check

• Type check

• Length check

• Presence check

A format check is used to:

• Ensure only numbers are entered

• Verify that data follows a required structure or pattern

• Prevent a field from being left blank

• Stop negative values from being entered

When is a type check useful?

• When verifying that a password includes special characters

• When ensuring a name field has at least five letters

• When validating that a phone number follows a specific format

• When ensuring that only numbers are entered in a price field

What happens if a validation rule is broken during data entry?

• The system automatically corrects the data

• The incorrect entry is deleted

• An error message is displayed

• The data is saved but marked as incorrect

Which validation method would prevent a student from entering an age of 200?

• Length check

• Format check

• Presence check

• Range check

If a field should contain only numeric values, which validation should be applied?

• Type check

• Format check

• Presence check

• Range check