update emp set sal=2460 where lower(ename)='scott';
select * from emp;
update emp set sal=sal*1.1, comm=sal*0.1
where deptno=20;
select * from emp where empno=7788;
select job from emp where ename='SCOTT';
update emp set job=default where ename='SCOTT'; --如果不存在默认值，会输出null
update emp set hiredate=to_date('1999/03/25','yyyy/mm/dd') where empno=7788;
--使用子查询更新数据--
update emp set
(job,sal,comm)=(select job,sal,comm from emp where ename='SMITH')
where ename='SCOTT';
select * from emp where lower(ename） in ('scott','smith');
--复制表数据
update employees set department_id=
(select deptno from emp where empno=7788)
where job_ID =(select job from emp where empno=7788);
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