Hiked Salary...

--Table Empmaster:-
create table Empmaster
(
empid int identity(1,1) constraint pkempid primary key clustered,
empname varchar(10),
empsalary numeric
)

insert Empmaster(empname,empsalary)values('Imran',5000)
insert Empmaster(empname,empsalary)values('Raja',5000)

--Table Salary:-
create table Salary
(
salid int identity(1,1) constraint pksalid primary key clustered,
empid int constraint fkempid foreign key references Empmaster(empid),
dos varchar(10),
salary numeric
)

insert Salary(empid,dos,salary)values('1','2005-08-01','5000')
insert Salary(empid,dos,salary)values('2','2005-08-01','5000')
insert Salary(empid,dos,salary)values('1','2005-09-01','5000')
insert Salary(empid,dos,salary)values('2','2005-09-01','7000')
insert Salary(empid,dos,salary)values('1','2005-10-01','7000')
insert Salary(empid,dos,salary)values('2','2005-10-01','7000')

i have two tables with relations. how do i find out whose salary has been hiked for the 9th month?