DB2和Oracle创建序列和查询的区别

DB2中：nextval for sequencename ，prevval for sequencename

  select nextval for seq_name from sysibm.sysdummy1;

  select prevval for seq_name from sysibm.sysdummy1;

 

oracle中：sequencename.nextval，sequencename.currval

  select seq_name.nextval from dual;

  select seq_name.currval from dual;

 

sysibm.sysdummy1是DB2内存中的一个特殊的表.