How to set auto-increment for ID in Oracle?

In Oracle, auto-increment ID can be achieved by creating sequences and triggers. Here is an example:

1. Create a sequence:

CREATE SEQUENCE id_sequence
START WITH 1
INCREMENT BY 1
NOCACHE;

1. Create a trigger.

CREATE OR REPLACE TRIGGER id_trigger
BEFORE INSERT ON your_table
FOR EACH ROW
BEGIN
  SELECT id_sequence.NEXTVAL INTO :NEW.id FROM dual;
END;

In the example above, a sequence named id_sequence is first created, followed by a trigger named id_trigger. The trigger automatically assigns a value to the id field when inserting a new record into the your_table table, achieving the setting of an auto-incrementing ID.

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