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 auto increment primary key

CREATE TABLE auto_increment_column_table (
 auto_increment_column_id NUMBER GENERATED ALWAYS AS IDENTITY,
 auto_increment_column_description VARCHAR2(50)
);

Source: arungudelli.com

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)
    );

Source: stackoverflow.com

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