What Is Data Validation & Data Verification

 Data Validation & Verification

Data validation

Data validation is done by the and there are three type of data validation.

(01)Type Check

In here the data type is checked into insure that. The type of the input data is correct before storing in a data base.

Ex:- It a text box which indicate the data in a form must be inserted the data a note.

(02)Presence Check

There are some key data which is used to identify other data in a data set. Presence check is checking out if the key data is available. 

Ex:- After filling a web application form the system will check those mandetary check boxes, weather they are filled or not.

(03) Range Check

There are different type of data that contains different ranges in a data set. In here the range is checked after the input process of data.

Ex:- Some passwords are programme to be consitern a certein range of character  set. If the enters password most less than the given range a massage will popup.

Data Verification 

The data Verification is done by the answer. There are three different method of data Verification.

(01)Visual Check

Visual check is checking errors by logging to the data.

Ex:-After entering a password there is a sign of eye. In this option we can see what we entered.

(02)Double Keying 

This method is used to check transecription errors. In here data will be entered twice( by two peoples) The computer will only accept the data from processing. If the two vertions are identical.

(03) Parity Check 

This is used to check transmission errors or it between memory and a disk. In generally, parity check is the quality of being even or odd. In parity check the recerverces end checks the received data check. To check weather is qualities even or odd.