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"]
取消辅修货车厂、段修时,分配阀质量保证期限为()。 ["6个月","1年","1个辅修期","1个段修期"]
额定电压交流()kV及以下的应为低压电器设备.器具和材料。 ["1","2","5","10"]
在全部人身保险业务中,()是人身保险中主要的和基本的险种。 ["人身意外伤害保险","人寿保险","健康保险","医疗保险"]
资产价值评估法反映的是企业资产的市场价值,具体方法有() ["调整账面价值法","市场价值法","重置价值法","清算价值法","盈利能力评估法"]
杨瑞清《走在行知的路上》提出学会()――学会爱,是教育者高智慧的体现。