相关疑难解决方法(0)

insert into OPT (email, campaign_id) values('mom@cox.net',100)
where not exists( select * from OPT where (email ="mom@cox.net" and campaign_id =100)) ;

错误报告:SQL错误:ORA-00933:SQL命令未正确结束00933. 00000 - "SQL命令未正确结束"*原因:
*操作:

如果在Oracle中不存在新行,如何插入？