how can i write torque Group By Query

Hi All
 
The following query i need to change by using torque query.
 
SELECT DEPT_NUMBER, DEPT_NAME, COUNT(DEPT_NUMBER) NUMBER_OF_EMPLOYEES FROM EMPLOYEES EMP, DEPARTMENTS DEPT
WHERE EMP.EMP_DEPT_NUMBER = DEPT.DEPT_NUMBER GROUP BY DEPT_NUMBER, DEPT_NAME 
 
i did the following by using torque query. but this is wrong. 
 
Please help me to correct the following query.
 
Criteria criteria = new Criteria();
criteria.addSelectColumn(DepartmentPeer.DEPT_NUMBER);
criteria.addSelectColumn(DepartmentPeer.DEPT_NAME);

criteria.addGroupByColumn(DepartmentPeer.DEPT_NUMBER);
criteria.addGroupByColumn(DepartmentPeer.DEPT_NAME);

criteria.addJoin(EmployeePeer.EMP_DEPT_NUMBER, DepartmentPeer.DEPT_NUMBER);
List deptList = DepartmentPeer.doSelect(criteria);
 
Thanks in Advance
Sasikumar


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