OCR GCSE Computer Science 2025 – 400 Free Practice Questions to Pass the Exam

A look-up table is commonly used in data validation to validate data against a set of acceptable values. This type of table provides a predefined list of valid entries that a particular data field can accept. For instance, if you are validating a field that requires a user to input a state or country, a look-up table can provide the valid options, allowing the data validation process to quickly check whether the user’s input matches any of those entries.

This method enhances the integrity and accuracy of the data being entered into a system by ensuring that only predefined and acceptable values are accepted, which helps in minimizing errors and inconsistencies in data collection. A look-up table serves as a straightforward reference point during the validation process, making it efficient for verifying input against known good values.

The other choices involve different aspects of data handling or programming that are not related to the primary function of look-up tables in validation processes. For example, checking data lengths relates to ensuring that input meets specified character counts rather than matching against accepted values, while analyzing program performance and reviewing code syntax focus on different facets of programming altogether.