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