Auto Incrementing primary key with Oracle

SQL> CREATE TABLE test
(id NUMBER PRIMARY KEY,
name VARCHAR2(30));

Table created.

SQL> CREATE SEQUENCE test_sequence
START WITH 1
INCREMENT BY 1;

Sequence created.

Now we can use that sequence in an BEFORE INSERT trigger on the table.

CREATE OR REPLACE TRIGGER test_trigger
BEFORE INSERT
ON test
REFERENCING NEW AS NEW
FOR EACH ROW
BEGIN
SELECT test_sequence.nextval INTO :NEW.ID FROM dual;
END;

Trigger created.

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Auto Incrementing primary key with Oracle