Testing process has revolutionized over a period of time; Business needs more tedious test effort in order to validate and verify all the data elements within the application and the system that has been designed. Data Testing varies in multiple ways, data testing can be done as part of an ETL Test effort, a Data mapping test effort where you are comparing data from the data base and relating the same on the application.

So, its important that every test analyst should be well skilled in SQL, an understanding of the database management system, the tools that are used to access the databases. This knowledge plays a very key role in perform an effective data validation test effort.