The user SCOTT executes the following command successfully to increase the salary values in one of his sessions： SQL> UPDATE emp SET sal=sal*1.15 WHERE deptno=20； Before SCOTT ends the transaction， user HR who has the privileges on EMP table executes a query to fetch the salary details but finds the old salary values instead of the increased values. Why does HR still see the old data？（） because of redo data from redo log file。 because of data from database buffer cache。 because of data from a temporary tablespace。 because of undo data from the undo tablespace。
现代市场政府规制的特点（） A.规制执行需要成本 。 B.政府是规制的主体 。 C.规制对时常交易机制有着直接的影响 。 D.企业和消费者是规制的客体。
对景
在线零售商可分为几类？（） 二。 三。 四。 五。
You created a profile APP_USER and assigned it to the users. After a month， you decide to drop theprofile.Some user sessions are currently connected to the database instance and are using the APP_USERprofile. This command is used to drop the profile： SQL> DROP PROFILE app_user； Which statement describes the result（） The command produces an error.。 The profile is dropped and current user sessions use the DEFAULT profile immediately.。 The profile is dropped and only the subsequent user sessions use the DEFAULT profile.。 The profile is dropped， the sessions are terminated， and the subsequent user sessions use theDEFAULT profile.。
资产评估中的资产具有的基本特征是（）。
