对于以下SQL语句说法正确的是() SELECT ename FROM emp WHERE sal IN (SELECT MAX(sal) FROM emp GROUP BY deptno);
对于ORACLE PL/SQL标识符(Identifier)的有效长度是()
You notice a performance change in your production Oracle 12c database. You want to know which change caused this performance difference.
Which method or feature should you use?()
免费的网站请分享给朋友吧