SQL injection is one of the most common web hacking techniques.

Answer 1

how we can use it?

Answer 2

A better question would be: how can it be avoided?

https://www.sololearn.com/discuss/1133096/?ref=app
https://www.sololearn.com/discuss/1085071/?ref=app
https://www.sololearn.com/discuss/1026223/?ref=app

Answer 3

so what's the question??