oracl遇到的问题

Posted 2021-02-13 tianqianlan

使用oracl数据库用

 ALTER TABLE Students

ADD CONSTRAINT PRINF_NAME_UNIQUE UNIQUE (sname)

添加唯一性约束，出现问题，报错为：an alter table validating constraint failed because the table has duplicate key values.  

 百度了一下找到问题，只要改为

ALTER TABLE Students
  ADD CONSTRAINT PRINF_NAME_UNIQUE UNIQUE (sname)
deferrable initially deferred NOVALIDATE; 

　详细的看链接：https://www.e-learn.cn/content/wangluowenzhang/492198