The EMP table contains these columns: LAST NAME VARCHAR2(25) SALARY NUMBER(6,2) DEPARTMENT_ID NUMBER(6) You need to display the employees who have not been assigned to any department. You write the SELECT statement: SELECT LAST_NAME, SALARY, DEPARTMENT_ID FROM EMP WHERE DEPARMENT_ID = NULL; What is true about this SQL statement? （） The SQL statement displays the desired results.。 The column in the WHERE clause should be changed to display the desired results.。 The operator in the WHERE clause should be changed to display the desired results.。 The WHERE clause should be changed to use an outer join to display the desired results.。
An administrator is moving a volume group from one server to another. The disks will be physically moved between the two systems. Which two operations are required on the volume group prior to the physical disk switch？（） ’varyoffvg’ and ’exportvg’。 ’varyofflv’ and ’importvg’。 ’varyofflv’ and ’migratepv’。 ’varyoffvg’ and ’migratevg&rsquo。
某施工单位承担一土石坝施工任务，该单位对坝基开挖做了施工组织设计，坝基基坑深为5.2m，采用药壶爆破法施工，土方量为9000m3，平均运距为10km，合同工期为8天。该施工单位有甲、乙、丙液压挖掘机各4台、2台、2台，A、B、C自卸汽车各12台、30台、18台，挖掘机的机械利用率为0.9，自卸汽车的机械利用率为0.95，其主要参数见表1、表2。
若挖掘机和自卸汽车只能取一种，而数量没有限制，如何组合最经济？说明理由。并计算其单方挖运直接费。
You are attempting to secure a MySQL server by using SSL encryption. On starting MySQL, you get this error: 130123 10:38:02 [ERROR] mysqld: unknown option '—ssl' What is the cause of the error?（） The — ssl level was not specified。 The server was not started with the – enable–ssl-plugin option。 — ssl is not a valid server option。 The mysqld binary was not compiled with SSL support。 The server's SSL certificate was invalid。
An insurance provider maintains a claims database where claims adjusters are adding new claims and updating existing claims everyday. In the evening， a batch process is run to analyze data entered throughout the day. To reduce costs， a shared storage solution is being considered. Which of the following questions should the consultant ask to select the best performing storage configuration that meets their budget requirements？（） What database is being used？。 Which client operating systems will access the database？。 Which vendor’s Fibre Channel switch do they prefer？。 What volume of data is analyzed each evening？。
You issued the following statement in your SQL*Plus session：
SQL>ALTER SESSION ENABLE RESUMABLE TIMEOUT 600；
Which operation is neither suspended nor resumed using the Automatic Resumable Allocation feature in your database？（）
