Select in if statement

Question

Hi!
create or replace procedure ......
begin
if not exists (select email from emails where email=f) then
end if;
end;
how to check in the if statement either mail exists in table or not?

Answer 1

I would maybe just do it like this:
create table emails as
    (select 'f' email
        from dual);
commit;
declare
    num pls_integer;
begin
    select count(email)
    into num
    from emails
    where email = 'f'
    if num != 0 then
        dbms_output.put_line('Exists');
    end if;
end;
Exists