A.(emp_id,emp_name)B.(emp_id,emp_name,emp_phone,dept_name)C.(emp_name,emp_phone,dept_
A.(emp_id,emp_name)
B.(emp_id,emp_name,emp_phone,dept_name)
C.(emp_name,emp_phone,dept_name)
D.(emp_id,emp_name,emp_phone,dept_name,dept_phone)
A.(emp_id,emp_name)
B.(emp_id,emp_name,emp_phone,dept_name)
C.(emp_name,emp_phone,dept_name)
D.(emp_id,emp_name,emp_phone,dept_name,dept_phone)
A、select sal+1 from emp;
B、select sal*10,sal*deptno from emp;
C、不能使用运算符号
D、select sal*10,deptno*10 from emp;
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 typical(66)language contains an applicative sub-language which approximates the mathematical abstractions of "timeless" functions applied to "spaceless" values, where the actual operation sequences and use of storage space during expression evaluation are organized behind the(67). In this setting, values are data structures of low volume, typically a few computer words or less, which means that an illusion of spacelessness can be realized by having(68)results during expression evalution stored at the discretion of the language implementation, and effecting parameter(69)and(70)operations through value copying.
A.imperative
B.mandatory
C.compulsory
D.voluntary
A.类层——模板层——系统层——算法层
B.算法层——类层——模板层——系统层
C.算法层——模板层——类层——系统层
D.类层——系统层——模板层——算法层
A.它描述了只有一个方法的类的集合
B.它能够保证一个类只产生一个惟一的实例
C.它描述了只有一个属性的类的集合
D.它能够保证一个类的方法只能被一个惟一的类调用
A.17500ms
B.15000ms
C.5000ms
D.25000ms
A.全部由软件实现
B.全部由硬件实现
C.由硬件和软件相结合实现
D.有的由硬件实现,有的由软件实现
A.响度
B.泛音
C.高音
D.波形声音
A.传值调用
B.引用调用
C.复制恢复
D.传名调用
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