i am trying to study SQL Injection nowadays & i am searching for good tutorial .
any recommendation for written or videos tutorial ?
I think you need to offer a bit more detail. We often combine UI, network traffic, stub feeds and sql as part of testing. The easiest is the latter.– Nigel HoathAug 7, 2014 at 10:00
Closing as an apparent duplicate - if the other question isn't what you're asking, then please add some more details to distinguish this question clearly from the one linked by Twaldigas.– testerabAug 10, 2014 at 19:28
I would suggest for any security related testing you start with OWASP:
OWASP have excellent overviews and descriptions as well as concrete guidance on testing and mitigation for most common classes of vulnerability.