I want to make a function that receives two parameters. The first one represents the salaries from a group of employees, and second one, the codes from a group of departments. Both, P_IN_SALARIES and P_IN_DEPARTMENTS_CODES parameters, will be used as arguments in an IN function of a query, just as demonstrated in the code below:
CREATE OR REPLACE FUNCTION public.get_employees_id(P_IN_SALARIES WHICH_TYPE_COMES_HERE, P_IN_DEPARTMENTS_CODES WHICH_TYPE_COMES_HERE)
RETURNS text
LANGUAGE plpgsql
AS $function$
declare
v_employees_ids text;
begin
select STRING_AGG(employee.id || '', ',') into v_employees_ids
from employee
inner join departament on department.id = employee.departament_id
where employee.salary in (P_IN_SALARIES)
and department.code in (P_IN_DEPARTMENTS_CODES);
RETURN v_employees_ids;
END;
$function$
In Oracle, you can use a collection data type:
CREATE TABLE number_list IS TABLE OF NUMBER;
Then you can use the MEMBER OF
operator rather than IN
:
CREATE FUNCTION public.get_employees_id(
P_IN_SALARIES IN number_list,
P_IN_DEPARTMENTS_CODES IN number_list
) RETURNS VARCHAR2
IS
v_employees_ids VARCHAR2(4000);
BEGIN
SELECT LISTAGG( id, ',' ) WITHIN GROUP ( ORDER BY id )
INTO v_employees_ids
FROM employee e
inner join departament d
on ( d.id = e.departament_id )
WHERE e.salary MEMBER OF P_IN_SALARIES
AND d.department.code MEMBER OF P_IN_DEPARTMENTS_CODES;
RETURN v_employees_ids;
END;
/
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