sql case and count

Hi. I am writing a query to use in a matrix rpt. I have three ticket types Internal, External, Other and escalate codes 1,2,3. I would like to count the number of tickets but if there are none i would still like the type to display 0. How can this be done? I used an iif statement in the format but something is still not displaying.

getting:
                Code1   code3
internal     1           0
other        0           2

would like to see:
               code1   code2  code3
internal   1           0          0
external  0           0          0
other      0           0          2