Oracle自增主键的添加[sequence]--表数据已存在

--增加主键ID
alter table CLERK_COMPARE add id number(16);

--设置sequence使ID自增
create sequence SEQ_ID
  minvalue 1
  maxvalue 999999999
  start with 1;

--将id的值设置为sequence
Update clerk_compare set id=seq_id.nextval;
commit;

--设置id为主键 
alter table CLERK_COMPARE
  add constraint CLERK_COMPARE primary key (ID);

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