题目内容
（请给出正确答案）
A、select firstname+’.’+lastname as ’name’ from employee )
B、select firstname+’.’+lastname=’name’ from employee
C、select ’name’=firstname+’.’+lastname from employee
D、select firstname,lastname from employee
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更多“现有表Employee，字段：id (int)，firstn…”相关的问题
A. select firstname+’.’+lastnameas’name’from employee
B. select firstname+’.’+lastname=’name’from employee
C. select’name’=firstname+’.’+lastnamefrom employee
D. select firstname，lastname from employee
A、to create their salvation through good works
B、to live acceptable to God
C、to pray in monasteries
D、to take immediate actions and perform duty
EMPLOYEE_ID NUMBER Primary Key
FIRST_NAME VARCHAR2(25)
LAST_NAME VARCHAR2(25)
HIRE_DATE DATE
Which UPDATE statement is valid?（）
A. UPDATE employees SET first_name = 'John' SET last_name ='Smith' WHERE employee_id = 180;
B. UPDATE employees SET first_name = 'John', SET last_name ='Smith' WHERE employee_id = 180;
C. UPDATE employees SET first_name = 'John' AND last_name ='Smith' WHERE employee_id = 180;
D. UPDATE employees SET first_name = 'John', last_name ='Smith' WHERE employee_id = 180
A、SELECT * FROM Actor WHERE FirstName LIKE 'Jim' AND LastName LIKE 'Carter'
B、SELECT FirstName='Jim', LastName='Carter' FROM Actor
C、SELECT * FROM Actor WHERE FirstName='Jim' AND LastName='Carter'
D、SELECT * FROM Actor WHERE FirstName='Jim' OR LastName='Carter'
B．包过滤技术对应用和用户是绝对透明的
C．代理服务技术安全性较高、但不会对网络性能产生明显影响
D．代理服务技术安全性高,对应用和用户透明度也很高
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