被后世誉为“方书之祖”的医著是( )

A. CREATE TABLE orders ( order_id NUMBER (10), customer_id NUMBER (8), order_status VARCHAR2 (10), date_ordered DATE = SYSDATE);

B. CREATE TABLE orders ( order_id NUMBER (10), customer_id NUMBER (8), order_status VARCHAR2 (10), date_ordered DATE DEFAULT SYSDATE);

C. CREATE OR REPLACE TABLE orders ( order_id NUMBER (10), customer_id NUMBER (8), order_status VARCHAR2 (10), date_ordered DATE DEFAULT SYSDATE);

D. CREATE OR REPLACE TABLE orders ( order_id NUMBER (10), customer_id NUMBER (8), order_status NUMBER (10), date_ordered DATE = SYSDATE);

E. CREATE TABLE orders ( order_id NUMBER (10), customer_id NUMBER (8), order_status NUMBER (10), date_ordered DATE = SYSDATE);

F. CREATE TABLE orders ( order_id NUMBER (10), customer_id NUMBER (8), order_status NUMBER (10), date_ordered DATE DEFAULT SYSDATE);

lowsandgrantstheEXECUTEprivilegeontheproceduretomanydatabaseusers：

CREATEORREPLACEPROCEDUREcreate_dept（v_deptnoNUMBER，v_dnameVARCHAR2，v_mgrNUMBER，v_locNUMBER）BEGIN

INSERTINTOhr.departmentsVALUES（v_deptno，v_dname，v_mgr，v_loc）；END；

Theusershavingpermissiontoexecutetheprocedureareabletoinsertrecordsintothe

DEPARTMENTStableeventhoughtheydonothavetheINSERTprivilegeonthetable.YouwantonlythoseuserswhohaveprivilegesontheDEPARTMENTStabletobeabletoexecutetheproceduresuccessfully.

WhatwouldyousuggesttothePL/SQLdeveloperstoachievethis（）

A.if后面只能带一条执行语句，如果你需要执行多条语句，则需要把它们放到话括号里面；

B.switch语句与if…elseif…else语句在功能上是对等的，二者可以互换；

C.switch结构中需要加入break语句，否则不能做到在执行完一个case之后就调处switch结构；

D.if…elseif…else结构是一种特殊的多元选择结构，它与if…else结构虽然形式上类似，但彼此没有任何关系；

E.if后面只能带一条执行语句，如果你需要执行多条语句，必须以函数的形式完成；

A.运行“磁盘清理”

B.运行Msconfig.exe

C.配置磁盘配额

D.配置“Windows备份”

A.powercfg.exe-devicequery all_devices

B.powercfg.exe-hibernateon

C.powercfg.exe-devicequery wake_armed

D.powercfg.exe–list

A.按主机面板上电源按钮

B.先关显示器

C.选开始，关闭系统中的关闭计算机

D.选程序中的MS—DOS方式，再关机