在使用序列的currval和nextval时的限制

创建一个序列

create sequence test_seq

minvalue 1

maxvalue 10000000

start with 1

increment by 1

cache 20;

在delete,select,update语句的子查询中不能使用sequence的值

SQL> delete from test_jy where test_id <(select test_seq.currval from dual);

delete from test_jy where test_id <(select test_seq.currval from dual)

ORA-02287: 此处不允许序号

SQL> select * from test_jy where test_id <(select test_seq.currval from dual);

select * from test_jy where test_id <(select test_seq.currval from dual)

ORA-02287: 此处不允许序号

SQL> update test_jy set test_id=0 where test_id <(select test_seq.currval from dual);

update test_jy set test_id=0 where test_id <(select test_seq.currval from dual)

ORA-02287: 此处不允许序号

在查询视图或物化视图时

SQL> select a.* from test_v a where a.userid

select a.* from test_v a where a.userid

ORA-02287: 此处不允许序号

带有distinct操作符的select语句不能使用

SQL> select distinct a.*,test_seq.currval from test_v a ;

select distinct a.*,test_seq.currval from test_v a

ORA-02287: 此处不允许序号

有group by,order by操作的select语句不能使用

SQL> select test_jy.*,test_seq.currval from test_jy group by test_jy.test_id;

select test_jy.*,test_seq.currval from test_jy group by test_jy.test_id

ORA-02287: 此处不允许序号

SQL> select test_jy.*,test_seq.currval from test_jy order by test_jy.test_id;

select test_jy.*,test_seq.currval from test_jy order by test_jy.test_id

ORA-02287: 此处不允许序号

有UNION, INTERSECT, MINUS操作符的语句不能使用

SQL> select test_jy.*,test_seq.currval from test_jy where test_id=1

2 union

3 select test_jy.*,test_seq.currval from test_jy where test_id=2;

select test_jy.*,test_seq.currval from test_jy where test_id=1

union

select test_jy.*,test_seq.currval from test_jy where test_id=2

ORA-02287: 此处不允许序号

SQL> select test_jy.*,test_seq.currval from test_jy where test_id=1

2 intersect

3 select test_jy.*,test_seq.currval from test_jy where test_id=2;

select test_jy.*,test_seq.currval from test_jy where test_id=1

intersect

select test_jy.*,test_seq.currval from test_jy where test_id=2

ORA-02287: 此处不允许序号

SQL> select test_jy.*,test_seq.currval from test_jy where test_id=1

2 minus

3 select test_jy.*,test_seq.currval from test_jy where test_id=2;

select test_jy.*,test_seq.currval from test_jy where test_id=1

minus

select test_jy.*,test_seq.currval from test_jy where test_id=2

ORA-02287: 此处不允许序号

在select语句中的where子句中

SQL> select test_jy.* from test_jy where test_id

select test_jy.* from test_jy where test_id

ORA-02287: 此处不允许序号

在create table或alter table语句的中default值是不能使用sequence

SQL> alter table test_jy modify test_id number(20) default test_seq.currval;

alter table test_jy modify test_id number(20) default test_seq.currval

ORA-00984: 列在此处不允许

还有就在check约束中不能使用

来自 “ ITPUB博客 ” ，链接：https://blog.itpub.net/26015009/viewspace-751448/ ，如需转载，请注明出处，否则将追究法律责任。

上一篇：查看表空间及文件大小的语句

下一篇： ora_rowscn伪列的用途

请登录后发表评论登录

全部评论

eric0435

系统架构师 Oracle ACE

注册时间：2011-10-12

博文量
716
访问量

6626377

ITPub博客

oracle中sequence使用的限制

最新文章