Evaluate these two SQL statements: SELECT last_name, salary, hire_dateFROM EMPLOYEES ORDRE BY salary DESC; SELECT last_name, salary, hire_dateFROM EMPOLYEES ORDER BY 2 DESC; What is true about them? （） The two statements produce identical results.。 The second statement returns a syntax error.。 There is no need to specify DESC because the results are sorted in descending order by default.。 The two statements can be made to produce identical results by adding a column alias for the salary column in the second SQL statement.。
You are a professional level SQL Server 2005 database administrator in an international corporation named Wiikigo. You are experienced in implementing high-availability solutions， monitoring the database server， and design deployment. In the company， you major job is the deployment， maintenance and support of Microsoft SQL Server 2005. You work as a database administrator for your company. More than a month ago， the SQL 2005 Server computer is deployed in operation. There are some query performance problems last week. Therefore， you perform an investigation on the locking contention. From the sys.dm_os_wait_stats dynamic management view （DMV）， you can see a high value in the max_wait_time_ms column. You want to check out whether this value is a factor which leads to the current performance problems. In addition， the impact on database users should e cut to the least. Which action should be performed to achieve the goal？（） To achieve the goal， the UPDATE STATISTICS command should be excuted.。 To achieve the goal， the SQL Server Service should be restarted.。 To achieve the goal， the SQL Server computer should be restarted.。 To achieve the goal， the statistics in the dynamic management view （DMV） should be reset.。
化学毒物在体内的吸收、分布和排泄过程称为（）。 生物转化。 消除。 生物转运。 代谢。
施工进度的动态检查在施工进度计划的实施过程中，由于各种因素的影响，常常会打乱原始计划的安排而出现（）。 进度偏差。 资金问题。 技术错误。 人事问题。
Which of the following commands will display any user defined verification methods？（） cldump。 clautover v。 clve c .custom v。 cllscustom t verify。
设备修理，拆卸时一般应（）。
