We generally use database testing for testing the properties like atomicity, consistency, isolation and durability of DB transactions. In the past databases were just used to store records. Whereas Database testing is used to ensure data mapping and ensures accuracy as well.

Database testing is to test the input values (from frontend) into backend(DB) using Queries.

if your are add form from frontend then check into DB that all info saved successfully into DB....

Database testing: to test the input/output values in DB. e.g  if we change anything in the frontend and backend then what will the effect on the database.

Using SQL queries we can test manulay like.... select, insert,update,delete