Help in Query Please

begin try
	begin tran
		delete from emp1 where empid in
		(
			select empid from emp2
		)

		insert into emp1
		select * from emp2 where empid not in
		(
			select empid from emp1
		)
	commit tran
end try
begin catch
	rollback tran
	raiserror('transaction failed !', 16, 255)
end catch