Executing SQL statements to check if the data submitted by a GUI program is updated properly in the database or not? Executing the statement the database is connecting to that particular changes, Updation or not it will test. Back end testing is testing the integration between the application(GUI) and the database. It is checking the changes made in the database are getting reflected in the application.
For Example, a couple of new columns is added to the database table. Here we test by giving values in the application and the value has to be stored in the database table.