Might Be a Silly Question But..

Greetings fellow scrubs :D

I was wondering if i should even learn PHP to start doing SQL injections for websites? (website hacking)

Because currently i'm learning Python which i am almost done with. Well not done but atleast finishig the book "Learn python the hard way". And now i wanna expand my knowledge in knowing how to conduct a hack / attack on websites. So ye:) That's why i question you guys if i need to learn PHP or just SQL?:)

Greetings

-Sinterklaas