DB2

复制代码 代码如下:

CREATE TABLE T1

(

id INTEGER NOT NULL GENERATED ALWAYS AS IDENTITY (START WITH 1 INCREMENT BY 1 MINVALUE 1 NO MAXVALUE NO CYCLE NO CACHE ORDER ),

...

);

Oracle（需要创建一个SEQUENCE和一个TRIGGER）：

复制代码 代码如下:

CREATE TABLE T1

(

id NUMBER(10,0) NOT NULL,

...

);

CREATE SEQUENCE T1_ID_SEQ INCREMENT BY 1 START WITH 1 NOMAXVALUE NOCYCLE CACHE 100 ORDER;

CREATE OR REPLACE TRIGGER INSERT_T1_ID

BEFORE INSERT ON T1

REFERENCING NEW AS new OLD AS old

FOR EACH ROW

BEGIN

SELECT T1_ID_SEQ.NEXTVAL INTO :new.id FROM DUAL;

END;

MySQL

复制代码 代码如下:

CREATE TABLE T1

(

id INT NOT NULL AUTO_INCREMENT,

...

);

PostgreSQL

复制代码 代码如下:

CREATE TABLE T1

(

id SERIAL NOT NULL,

...

);

SQL Server

复制代码 代码如下:

CREATE TABLE T1

(

id INT NOT NULL IDENTITY,

...

);

Sybase

复制代码 代码如下:

CREATE TABLE T1

(

id INT NOT NULL IDENTITY,

...

);