What are the ways to validate if a database table has been updated after you enter data from a front-end application?

This depends on the interface which is being used in that front-end application. Ways to validate it-

• The front-end application’s interface allows view functionality to users to verify updated data.
• If you can’t view the functionality of data that is entered, then database updates can be checked by using relevant SQL/Oracle queries.
• The checkpoint function of WinRunner or QTP can also be used to check if a database has been updated.