oracle中sequence使用的限制

eric0435發表於2012-12-20

Oracle

在使用序列的currval和nextval時的限制

建立一個序列

create sequence test_seq

minvalue 1

maxvalue 10000000

start with 1

increment by 1

cache 20;

在delete,select,update語句的子查詢中不能使用sequence的值

SQL> delete from test_jy where test_id

delete from test_jy where test_id

ORA-02287: 此處不允許序號

SQL> select * from test_jy where test_id

select * from test_jy where test_id

ORA-02287: 此處不允許序號

SQL> update test_jy set test_id=0 where test_id

update test_jy set test_id=0 where test_id

ORA-02287: 此處不允許序號

在查詢檢視或物化檢視時

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

select a.* from test_v a where a.userid

ORA-02287: 此處不允許序號

帶有distinct操作符的select語句不能使用

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

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

ORA-02287: 此處不允許序號

有group by,order by操作的select語句不能使用

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: 此處不允許序號

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: 此處不允許序號

有UNION, INTERSECT, MINUS操作符的語句不能使用

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: 此處不允許序號

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: 此處不允許序號

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: 此處不允許序號

在select語句中的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: 此處不允許序號

在create table或alter table語句的中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: 列在此處不允許

還有就在check約束中不能使用

來自 “ ITPUB部落格 ” ，連結：http://blog.itpub.net/26015009/viewspace-751448/，如需轉載，請註明出處，否則將追究法律責任。

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eric0435

系統架構師,ACOUG MEMBER,Oracle ACE,Mail:yongjing.star@gmail.com Mobile:13875984558 QQ:409898894 Blog:www.jydba.net

註冊時間：2011-10-12

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oracle中sequence使用的限制

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