How to execute procedure with dynamic where condition.

Question

Hi All,
I am facing a probelem
Issue :
I am having a parameter p_id in my procedure based on the value of this parameter i want to change the where condition.
How to do so?
Code:---------
create or replace procedure p_1
( p_id in emp_dummy.empno%type)
is
parameter_1 varchar2(2000);
v_sal number;
begin
if p_id = 1 then
parameter_1 := 'where empno = 1';
else
parameter_1 := 'where 1=1';
end if;
select salary into v_sal from emp_dummy||' '||parameter_1;
end;

Answer 1

Dynamic SQL is not the best of ideas, but if you must...
EXECUTE IMMEDIATE 'select salary from emp_dummy where empno=nvl(:x,empno)' into v_sal using p_id;Then if you pass in the p_id to the procedure it will select the salary for that employee and if null is passed in then it will select the salary for all employees. Now here's a problem because you are trying to return a single value and if you don't specify the employee then it will try and return multiple values from that select, so you probably want to do something like give the sum of the salaries...
EXECUTE IMMEDIATE 'select sum(salary) from emp_dummy where empno=nvl(:x,empno)' into v_sal using p_id;