摘要： 创建学生表：Create table student(sid INT primary key,sname varchar(20))创建日志表：Create table log_sutdent(LOGID INT primary key,CONTENT VARCHAR2(20),UPDATEDATA DATE)创建序列：Create Sequence seq start with 1increment by 1minvalue 1maxvalue 1000000nocyclecache 20;创建触发器,记录对表的操作：create or replace trigger tr_test befo 阅读全文