Answers for "how to add auto increment column in oracle"

oracle auto_increment

-- Use a sequence:
CREATE SEQUENCE id_seq START WITH 1;
INSERT INTO my_table (ID, VALUE) VALUES (id_seq.NEXTVAL, 'My value');

oracle create table auto generated primary key

-- For oracle 12c or later 
-- auto inc
create table t1 (
    c1 NUMBER GENERATED by default on null as IDENTITY,
    c2 VARCHAR2(10)
    );
-- More options for initial value and increment value
create table t1 (
    c1 NUMBER GENERATED ALWAYS as IDENTITY(START with 1 INCREMENT by 1),
    c2 VARCHAR2(10)
    );