How to change below procedure to (update & insert) instead of (delete &insert) in Oracle - oracle

Question

I want to update the record if already exists based on where condition or else insert. I have written query with delete and insert I am facing difficulty into converting into update and insert.
PS: I have tried using SQL%ROWCOUNT but I think i missed somewhere in syntax.
Any help would be appreciated.
Below is the proc i am using
Create Or Replace Procedure sal_proc(Empid Varchar2,Fmdt Date,bp Number)
As
Begin
--delete
delete from Emp_Sal
Where Empid = Empid
And Fmdt = Fmdt;
--insert
Insert Into Emp_Sal(empid,fmdt,Basicpay) Values (empid,fmdt,Bp);
End;

Answer 1

You do not need a procedure; you can use MERGE to update or insert a row at the same time:
merge into Emp_Sal e
using (
/* your values to insert/update */
select 2 as Empid, 'c' as Fmdt, 100 as Bp from dual
) x
on ( e.Empid = x.Empid And e.Fmdt = x.Fmdt)
when matched
then /* if a record exists, update */
update set Basicpay = Bp
when not matched
then /* it the record does not exist, insert */
insert values (x.empid, x.fmdt, x.Bp)
Of course you can use this inside a procedure to handle your input parameters or do whatever you may need to do in your procedure:
Create Or Replace Procedure sal_proc(Empid Varchar2,Fmdt Date,bp Number)
As
Begin
merge into Emp_Sal e
using (
/* your values to insert/update */
select Empid as Empid, Fmdt as Fmdt, bp as Bp from dual
) x
on ( e.Empid = x.Empid And e.Fmdt = x.Fmdt)
when matched
then /* if a record exists, update */
update set Basicpay = Bp
when not matched
then /* it the record does not exist, insert */
insert (empid,fmdt,Basicpay) values (x.empid, x.fmdt, x.Bp);
End;
An hint: use parameter names different fron column names to avoid confusion; a good practice could be use parameter names like p_XXX; just an example of how dangerous this can be:
SQL> create or replace procedure checkPar(n in number) is
2 c number;
3 begin
4 select count(1)
5 into c
6 from checkTab
7 where n = n;
8 --
9 dbms_output.put_line(c);
10 end;
11 /
Procedure created.
SQL> select * from checkTab;
N
----------
1
2
3
SQL> exec checkPar(1);
3
PL/SQL procedure successfully completed.
SQL> exec checkPar(999);
3
PL/SQL procedure successfully completed.

Answer 2

Not very efficient way but should work if huge data is not present in tables
CREATE OR REPLACE PROCEDURE sal_proc (E_Empid VARCHAR2, F_Fmdt DATE, b_bp NUMBER)
AS
var number;
BEGIN
Begin
--Checking if record exists
select 1
into var
from Emp_Sal
Where Empid = E_Empid
And Fmdt = F_Fmdt;
exception
when no_data_found then
var:= 0;
End;
if var <> 1 then
--insert
INSERT INTO Emp_Sal (empid, fmdt, Basicpay)
VALUES (e_empid, f_fmdt, b_Bp);
else
update Emp_Sal
set col ....<>;
end if;
END;