今天遇到一个关于SQL转换成Oracle语句的问题，描述如下：
select * from emp order by deptno;
select * from dept;
Sql Server:
update dept a set dname=(select top 1 ename from emp where deptno=a.deptno order by sal)
经过尝试，查找资料，得出下面转换结果，不知道这样是否可行：
update dept a set dname=
(with t as(select ename,deptno from emp order by sal)
select ename from t where deptno=a.deptno and rownum=1)
where exists(with t as(select ename,deptno from emp order by sal)
select null from t where deptno=a.deptno)
执行结果：
select * from dept;
其他替代方法随后再做尝试。