SQL Injections (Trainining)

Question

I'm practicing grey-hat hacking...

And I need some good sql injections. and some sites I could practive on

for the sql injections examples like these

- '='a

1 '=' --

Thank you

Answer 1

Why not stand up your own servers in a small network in your house to practice hacking with?    

Answer 2

Setup a small internal network to practise on, or use VM Tools.

Another string which is quite fun to use is ' OR x=x--

Lastly search google, there's plenty websites out there who offer hacking challenges - http://www.hackthissite.org/ is an awesome one