Oracle中设置自增主键

创建表Student

Create Table Student(

id number(12) primary key, --通过序列和触发器实现id的自增

name varchar2(20) ,

age number(3) ,

sex number(1)

)

创建序列Sequence

Create Sequence SEQ_STUDENT

minvalue 1

maxvalue 99999999999999999999

start with 1 --从1开始

increment by 1 --增量为1

cache 0

order;

创建触发器Trigger

Create or Replace Trigger STUDENT_AUTOINCREMENT

Before Insert on Student

For Each Row

When (NEW.ID IS NULL)

Begin

Select SEQ_STUDENT.NEXTVAL INTO :NEW.ID FROM DUAL;

End;