Information Communication Technology ICT – 15 Proofing | e-Consult

Validation is crucial for maintaining the accuracy and integrity of a database. It ensures that the data entered is correct, consistent, and meets pre-defined criteria. Without validation, errors can creep into the database, leading to unreliable information and potentially flawed decision-making. Here are four validation checks and examples:

• Range Check: Ensures a value falls within a specified minimum and maximum. For the 'age' field, a range check would ensure the entered age is between 4 and 18. An invalid input would be an age of 2 or 20.
• Character Check: Ensures that a field contains only allowed characters. For the 'student name' field, a character check might restrict input to letters, spaces, and hyphens. An invalid input would include numbers or special symbols.
• Length Check: Ensures a field is of a specific length. For the 'student name' field, a length check might require a name to be between 3 and 50 characters. An invalid input would be a name that is too short (e.g., "Jo") or too long (e.g., a very long string of characters).
• Type Check: Ensures that the data entered is of the correct data type. For the 'email address' field, a type check would ensure that the input is a valid email format (e.g., username@domain.com). An invalid input would be a string of characters that doesn't resemble an email address.