Oracle update和order by

Oracle update和order by

今天遇到一個關於SQL轉換成Oracle語句的問題，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)

經過嘗試，尋找資料，得出下面轉換結果，不知道這樣是否可行：

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)

執行結果：

select * from dept;

其他替代方法隨後再做嘗試。