basic SQL: selecting AVG() values depending two columns : I want to get AVG values depending two columns value.

Here is my table example [example][1];

And this is what i need to [get][2];

I'm using that code to get required data but it gives me average for issue not isssue and owner

and here is my code;

    select issue, owner, AVG(time) from myTable group by issue, owner

Any suggestion about that?


  [1]: http://i.stack.imgur.com/ptSqg.png
  [2]: http://i.stack.imgur.com/ZZK28.png