Untitled

--6 pl/sql boolean function
create or replace function check_complaints(apt_in IN number)
    return boolean is
    complaint_count number;
    result boolean;
    
begin
    SELECT COUNT(*) INTO complaint_count
    FROM complaints
    WHERE apt_no = apt_in
    And (status = 'p' OR status IS NULL);
    
    IF complaint_count > 0 THEN
        result := TRUE;
    ELSE
        result := FALSE;
    END IF;
    
    RETURN result;
END check_complaints;
/

declare 
apt_in number; 
begin 
if check_complaints(200) then 
dbms_output.put_line('complaint exists'); 
else 
dbms_output.put_line('no complaint'); 
end if; 
end; 
/