Oracle 更改表主键
1.先删除主键
alter table T_SF_SUPPLIER drop constraint PK_T_SF_SUPPLIER;
2.增加主键
alter table T_SF_SUPPLIER
  add constraint PK_T_SF_SUPPLIER primary key (sp_id)
  using index
  tablespace SYSTEM
  pctfree 10
  initrans 2
  maxtrans 255
  storage
  (
    initial 64K
    minextents 1
    maxextents unlimited
  );