Checkbox Style Query in Oracle Apex

Step-1 :
=====
Create Region. 
Name : Check Box
Type : Static Content

Create New Item this Region.
Name : P2_DEPARTMENTS
Type : CheckBox
List Of Values -
Type : SQL Query
SELECT DEPARTMENT_NAME,DEPARTMENT_ID FROM DEPARTMENTS ORDER BY 1;

Create Dynamic Action on P2_DEPARTMENTS
Action - Refresh
Affected Elements - Selection type - Region
Region - Employees

Step-2 :
=====
Create New Region.
Name : Employees
Type : Interactive Report
SQL Query :

select E.EMPLOYEE_ID,
       E.FIRST_NAME,
       E.LAST_NAME,
       E.EMAIL,
       E.PHONE_NUMBER,
       E.HIRE_DATE,
       E.JOB_ID,
       E.SALARY,
       E.COMMISSION_PCT,
       E.MANAGER_ID,
        D.DEPARTMENT_NAME
  from EMPLOYEES E, DEPARTMENTS D
 where E.DEPARTMENT_ID=D.DEPARTMENT_ID
 AND INSTR( :P2_DEPARTMENTS, D.DEPARTMENT_ID)>0
AND D.DEPARTMENT_ID IS NOT NULL

Page Items to Submit : P2_DEPARTMENTS