Sequence: Define a Sequence to generate sequential numbers automatically
example:可以在 update、select、insert语句中使用
SQL> ed
Wrote file afiedt.buf
1 create sequence test_seq
2 increment by 10
3 start with 100
4 maxvalue 200
5 minvalue 110
6 cycle
7* nocache
SQL> /
create sequence test_seq
*
ERROR at line 1:
ORA-04006: START WITH cannot be less than MINVALUE
SQL> ed
Wrote file afiedt.buf
1 create sequence test_seq
2 increment by 10
3 start with 120
4 maxvalue 200
5 minvalue 110
6 cycle
7* nocache
SQL> /
Sequence created.
SQL> select test_seq.nextval from dual;
NEXTVAL
----------
120
SQL> select test_seq.currval from dual
CURRVAL
----------
120
SQL>