From the webpage:
An SQL injection cheat sheet is a resource in which you can find detailed technical information about the many different variants of the SQL Injection vulnerability. This cheat sheet is of good reference to both seasoned penetration tester and also those who are just getting started in web application security.
…
If you are interested in helping government agencies or corporations locate insecure web applications, this cheat sheet will come in handy.
For governments remember that older, unpatched databases are the rule rather than the exception.