Data validation

Data validation is a process of ensuring that a program operates on clean, correct and useful data. Data validation provide certain well-defined guarantees for fitness, accuracy, and consistency for user/stream/data input into an application. It can designed using various methodologies, and be deployed in any of various contexts.

Different kinds of data validation

• Data type validation
  It carried out on one or more simple data fields. data field is consistent with expected data type (such as number, string, etc.)
  
• Range and constraint validation
  Data is consist with a minimum/maximum range, or with a evaluating a sequence of characters
  
• Code and Cross-reference validation
  Code and cross-reference validation includes tests for data type validation, combined with one or more operations to verify the data by with supplied data or known look-up table
  
• Structured validation
  It allows for the combination of any of various basic data type validation steps, along with more complex processing steps. It can handle complex data objects.