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Oracle使用序列填充代理主键自增

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2016-06-07 17:00:381285browse

创建表tmp_tab,并将序列seqId使用于主键id新建序列:create sequence seqId start with 1 increment by 1;新建表空间:create t

创建表tmp_tab,,并将序列seqId使用于主键id

新建序列:create sequence seqId start with 1 increment by 1;

新建表空间:create table tmp_tab(id  integer constraint seq1 primary key,col1 varchar2(10),mod_date date default sysdate)

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插入数据:insert  into tmp_tab(id ,  col1)values(seq1.nextval, ‘Hello’)

修改序列:

使用ALTER  SEQUENCE语句修改

不能修改序列的初始值

序列的最小值不能大于当前值

序列的最大值不能小于当前值

修改序列seq1,让其增量值为2

语句如下:

alter  sequence  seq1

increment  by  2;

删除序列:

drop sequence  seq1;s

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