Explain filtering data and validating data

Finally, the primary key constraint is a mixture of the unique constraint and the not null constraint meaning the no two rows can have the same values in their columns and that a column must have data.

Data cleansing or data cleaning is the process of detecting and correcting (or removing) corrupt or inaccurate records from a record set, table, or database and refers to identifying incomplete, incorrect, inaccurate or irrelevant parts of the data and then replacing, modifying, or deleting the dirty or coarse data.

If the attribute marks a controller, the action filter applies to all action methods in that controller.

We will also discuss the different data validation techniques that you can use to optimize results.e Surveys Pro helps you develop your surveys quickly -- and save your specialized questions to assure consistency from survey to survey.The different types of questions provided by e Surveys Pro are as follows: Single Select: When you want respondents to choose just one alternative, use a single select question.Based on your objective, you have to decide what types of questions will give you the information you need.Each question type is unique and provides different types of data.

Explain filtering data and validating data