Join two list of integer type field using CAML query

Hi

As i am struggling in Join two sharepoint list (Roles and Emplyees). As there is no lookup columns and lists are already existing and have almost 3000 + recodrs. As a part of enhancement work need to join these list. List structure is some thing as follows: 

Roles :

ID                              Title

_____                       ____________________

1                               Project Manager

2                               Business Analyst

3                              Developer

Employees :

Name                       Role

_______                 _________

1 James                  1

2 Petar                    3

3 John                     2

Output should be like as follows:

_______________

Name                       Role

_______                 _________

1 James                  Project Manager

2 Petar                    Developer

3 John                     Developer

So please suggest, if the joining can be done other than lookup columns through the CAML query.

Akhilesh Rao