Oracle数据库中创建自增主键的实例教程

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) ) 

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; 

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; 

SELECT * FROM DAYSBFJ.DAYS_CARD_UPDATE3 order by id asc--alter table DAYSBFJ.DAYS_CARD_UPDATE3 add source_Flag varchar2(2);--create sequence DAYS_CARD_UPDATE2_SEQ_ID minvalue 1 maxvalue 999999999 start with 1;--Update DAYSBFJ.DAYS_CARD_UPDATE2 set id = DAYS_CARD_UPDATE2_SEQ_ID.nextval;--update DAYSBFJ.DAYS_CARD_UPDATE3 set SOURCE_FLAG = '2'

create table test1(name1 varchar2(40),city varchar2(40));

insert into test1 values('name1','nanjing');insert into test1 values('name1','nanjing');insert into test1 values('name2','nanjing1');insert into test1 values('name3','nanjing2');insert into test1 values('name4','nanjing3');insert into test1 values('name5','nanjing4');insert into test1 values('name6','nanjing5');insert into test1 values('name7','nanjing6');insert into test1 values('name8','nanjing7');insert into test1 values('name9','nanjing8');insert into test1 values('name10','nanjing9');insert into test1 values('name10','nanjing9');insert into test1 values('name12','nanjing11');insert into test1 values('name13','nanjing12');insert into test1 values('name14','nanjing13');commit;

alter table TEST1 add id number(10);

create sequence SEQ_ID minvalue 1 maxvalue 999999999 start with 1;

Update test1 set id=seq_id.nextval;commit;

alter table TEST1 add constraint PK_TEST1 primary key (ID); select ID,Name1,CITY from TEST1;