Follow these simple steps :
1. download the Sql poison Tool from Here [rar password: h4ckerzvilla]
2. extract it from archieve
3. open Sql poison ,csee left hand side there is a huge list of dorks, select any one you can see it in screen shot.
4. press on play button it will scan websites
5. now right click on scanned websites, select all & move them to sqli crawler .
6.last step press crawl button nd it will give the website with a red marker that shows the website has rows or column error & is vul to sqli.
7. u can lso apply sql injection by sending the url to injection builder.
thancu guyzz fr reading my article ..pls comment if got any query. hope you liked it.