How to Create an ID with AUTO_INCREMENT on Oracle?

So you know that the AUTO_INCREMENT and SERIAL data types were invented for two purposes: to establish a unique key within a table and to produce a sequence of numbers that can be used as an identity generator. Here's how you can use them in Oracle.

oracle auto_increment

By VasteMondeVasteMonde on Jan 31, 2021
-- Use a sequence:
CREATE SEQUENCE id_seq START WITH 1;
INSERT INTO my_table (ID, VALUE) VALUES (id_seq.NEXTVAL, 'My value');

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2

oracle create table auto generated primary key

By TitatovenaarTitatovenaar on May 04, 2020
-- 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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0

oracle create auto increment column

By Graceful GoatGraceful Goat on Apr 03, 2020
CREATE TABLE animals (
     id MEDIUMINT NOT NULL AUTO_INCREMENT,
     name CHAR(30) NOT NULL,
     PRIMARY KEY (id)
);

INSERT INTO animals (name) VALUES
    ('dog'),('cat'),('penguin'),
    ('lax'),('whale'),('ostrich');

SELECT * FROM animals;
+----+---------+
| id | name    |
+----+---------+
|  1 | dog     |
|  2 | cat     |
|  3 | penguin |
|  4 | lax     |
|  5 | whale   |
|  6 | ostrich |
+----+---------+

Source: docs.oracle.com

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-1

AUTO_INCREMENT attribute can be added to any column, so you can pre-assign a value to that column.

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