sql - insert if not exists

Question

I am having trouble with a sql query. I need to insert a row if the same row does not exist already. This is what I have so far:

DECLARE
BEGIN
   FOR FOLDE         


        

Answer 1

DECLARE
    N_COUNTS NUMBER;
BEGIN
    select count(ID) into N_COUNTS from TABLE_NAME where ID = 1;
    IF N_COUNTS=0 THEN
        INSERT QUERY....
    ELSE
        UPDATE QUERY....
    END IF;
END;