SQL injection is a technique to maliciously exploit applications that use client-supplied data in SQL statements. Attackers trick the SQL engine into executing unintended commands by supplying specially crafted string input, thereby gaining unauthorized access to a database in order to view or manipulate restricted data.
SQL injection techniques may differ, but they all exploit a single vulnerability in the application
I would like you can shoot below link to know SQL Injection with some example.this is educational purpose.
http://st-curriculum.oracle.com/tutorial/SQLInjection/index.htm
