Search Builder One of parameters is not of the type MysqlColumnName
I just tried to replicate this problem on the demo site but couldn't.

I would recommend upgrading to Civi 4.7.9, and if you still have the problem, you can do two things:


Try to replicate it on the demo server (demo.civicrm.org).  If you can't, the issue is most likely in the configuration.
The "DB Error" isn't really enough info to go on.  So you can go to Administer menu » System Settings » Debugging and Error Handling, and set "Debug mode" and "backtrace" to "yes".  That will give you a much more detailed error.  Updating your question with that info will let folks provide much more detailed information!