how to get fromdate to todate wise get current month record?

How to get current month details in from date to todate wise in sql

My query:

select a.Staff_Id as StaffID,a.From_Date,upper(b.Staff_Name) as StaffName,a.From_Date
,a.To_Date,a.Total_Days as TotalDays,Convert(Varchar(24),
Applied_Date,113) as Applied,a.Reason as Reason,Status=(case a.Status when 'I' then 'Applied' when 'A'then 'Approved' when 'R' then 'Rejected' when 'C' then 'Cancelled' else a.status end),Done_By =(select upper(staff_name) from Accounts_Emp_Master emp where emp.staff_id = Done_by),Convert(Varchar(11),Done_Date,106)
as DoneDate from Accounts_LeaveEntry_New a,Accounts_Emp_Master b where a.Staff_Id = b.Staff_Id
AND (('2014-12-01' <= a.From_Date And '2014-12-01' >= a.To_Date) or ('2014-12-01' >=a.From_Date and '2014-12-01' <= a.To_Date))
and (b.Department = 3) order by a.From_Date asc

above query wise

First Check:
(('2014-12-01' <= a.From_Date And '2014-12-01' >= a.To_Date) or ('2014-12-01' >=a.From_Date and '2014-12-01' <= a.To_Date)) this date wise above query check Last month record came
ex:
StaffID    StaffName                   Fromdate     ToDate     TotalDays   AppliedDate
1059       T T SIVAM                   29-Nov-14    7-Dec-14     7            24-Nov-14
1029       ROY CHOUDURY P K  1-Dec-14      31-Jan-15    54           13-Nov-14

I want result is (december)month first date record only
StaffID StaffName                  Fromdate   ToDate      TotalDays   AppliedDate
1029    ROY CHOUDURY P K  1-Dec-14    31-Jan-15    54            13-Nov-14