在使用Oracle序列的currval和nextval时的限制,在delete,select,update语句的子查询中不能使用sequence的值
在使用oracle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
delete from test_jy where test_id
ORA-02287: 此处不允许序号
SQL> select * from test_jy where test_id
select * from test_jy where test_id
ORA-02287: 此处不允许序号
SQL> update test_jy set test_id=0 where test_id
update test_jy set test_id=0 where test_id
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
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